diff --git a/packages/frontend-2/components/projects/Dashboard.vue b/packages/frontend-2/components/projects/Dashboard.vue
index 52f4c5a83..e294c1926 100644
--- a/packages/frontend-2/components/projects/Dashboard.vue
+++ b/packages/frontend-2/components/projects/Dashboard.vue
@@ -18,10 +18,6 @@
     </div>
 
     <PromoBannersWrapper v-if="promoBanners.length" :banners="promoBanners" />
-    <div v-if="showErrorTest" class="w-full">
-      <FormButton @click="testError">Test error</FormButton>
-    </div>
-
     <div
       v-if="!showEmptyState"
       class="flex flex-col space-y-2 md:flex-row md:items-center mb-8 pt-4"
@@ -134,7 +130,6 @@ const promoBanners = ref<PromoBanner[]>([
   }
 ])
 
-const route = useRoute()
 const { activeUser, isGuest } = useActiveUser()
 const { triggerNotification } = useGlobalToast()
 const areQueriesLoading = useQueryLoading()
@@ -160,8 +155,6 @@ const { onResult: onUserProjectsUpdate } = useSubscription(
   onUserProjectsUpdateSubscription
 )
 
-const showErrorTest = computed(() => route.query.showErrorButton === '1')
-
 const projects = computed(() => projectsPanelResult.value?.activeUser?.projects)
 const showEmptyState = computed(() => {
   const isFiltering =
@@ -340,8 +333,4 @@ const clearSearch = () => {
   selectedRoles.value = []
   updateSearchImmediately()
 }
-
-const testError = () => {
-  throw new Error('what duhh hell')
-}
 </script>
diff --git a/packages/frontend-2/components/viewer/compare-changes/Panel.vue b/packages/frontend-2/components/viewer/compare-changes/Panel.vue
index 725aab0c2..dccf00e71 100644
--- a/packages/frontend-2/components/viewer/compare-changes/Panel.vue
+++ b/packages/frontend-2/components/viewer/compare-changes/Panel.vue
@@ -66,7 +66,7 @@ import { ChevronLeftIcon } from '@heroicons/vue/24/solid'
 import { VisualDiffMode } from '@speckle/viewer'
 import { useInjectedViewerState } from '~~/lib/viewer/composables/setup'
 import { uniqBy, debounce } from 'lodash-es'
-import type { SpeckleObject } from '~~/lib/common/helpers/sceneExplorer'
+import type { SpeckleObject } from '~~/lib/viewer/helpers/sceneExplorer'
 import { useMixpanel } from '~~/lib/core/composables/mp'
 
 defineEmits<{
diff --git a/packages/frontend-2/components/viewer/explorer/Explorer.vue b/packages/frontend-2/components/viewer/explorer/Explorer.vue
index db9277dc1..0cc816be5 100644
--- a/packages/frontend-2/components/viewer/explorer/Explorer.vue
+++ b/packages/frontend-2/components/viewer/explorer/Explorer.vue
@@ -75,7 +75,7 @@ import {
   CodeBracketIcon
 } from '@heroicons/vue/24/solid'
 import { ViewerEvent } from '@speckle/viewer'
-import type { ExplorerNode } from '~~/lib/common/helpers/sceneExplorer'
+import type { ExplorerNode } from '~~/lib/viewer/helpers/sceneExplorer'
 import {
   useInjectedViewer,
   useInjectedViewerLoadedResources,
diff --git a/packages/frontend-2/components/viewer/explorer/Filters.vue b/packages/frontend-2/components/viewer/explorer/Filters.vue
index f73b27bf9..2c1cd40f7 100644
--- a/packages/frontend-2/components/viewer/explorer/Filters.vue
+++ b/packages/frontend-2/components/viewer/explorer/Filters.vue
@@ -82,11 +82,11 @@
     </div>
     <div v-if="activeFilter">
       <ViewerExplorerStringFilter
-        v-if="activeFilter.type === 'string'"
+        v-if="stringActiveFilter"
         :filter="stringActiveFilter"
       />
       <ViewerExplorerNumericFilter
-        v-if="activeFilter.type === 'number'"
+        v-if="numericActiveFilter"
         :filter="numericActiveFilter"
       />
     </div>
@@ -95,13 +95,13 @@
 <script setup lang="ts">
 import { ChevronDownIcon, ChevronUpIcon } from '@heroicons/vue/24/solid'
 import { ArrowPathIcon } from '@heroicons/vue/24/outline'
-import type {
-  PropertyInfo,
-  StringPropertyInfo,
-  NumericPropertyInfo
-} from '@speckle/viewer'
+import type { PropertyInfo, StringPropertyInfo } from '@speckle/viewer'
 import { useFilterUtilities } from '~~/lib/viewer/composables/ui'
 import { useMixpanel } from '~~/lib/core/composables/mp'
+import {
+  isNumericPropertyInfo,
+  isStringPropertyInfo
+} from '~/lib/viewer/helpers/sceneExplorer'
 
 const {
   setPropertyFilter,
@@ -150,9 +150,8 @@ const relevantFilters = computed(() => {
   })
 })
 
-const speckleTypeFilter = computed(
-  () =>
-    relevantFilters.value.find((f) => f.key === 'speckle_type') as StringPropertyInfo
+const speckleTypeFilter = computed(() =>
+  relevantFilters.value.find((f) => f.key === 'speckle_type')
 )
 const activeFilter = computed(
   () => propertyFilter.filter.value || speckleTypeFilter.value
@@ -169,9 +168,12 @@ watch(activeFilter, (newVal) => {
   })
 })
 
-// Using these as casting activeFilter as XXX in the prop causes some syntax highliting bug to show. Apologies :)
-const stringActiveFilter = computed(() => activeFilter.value as StringPropertyInfo)
-const numericActiveFilter = computed(() => activeFilter.value as NumericPropertyInfo)
+const stringActiveFilter = computed(() =>
+  isStringPropertyInfo(activeFilter.value) ? activeFilter.value : undefined
+)
+const numericActiveFilter = computed(() =>
+  isNumericPropertyInfo(activeFilter.value) ? activeFilter.value : undefined
+)
 
 const searchString = ref<string | undefined>(undefined)
 const relevantFiltersSearched = computed(() => {
@@ -229,7 +231,7 @@ const toggleColors = () => {
 // Handles a rather complicated ux flow: user sets a numeric filter which only makes sense with colors on. we set the force colors flag in that scenario, so we can revert it if user selects a non-numeric filter afterwards.
 let forcedColors = false
 const refreshColorsIfSetOrActiveFilterIsNumeric = () => {
-  if (activeFilter.value.type === 'number' && !colors.value) {
+  if (!!numericActiveFilter.value && !colors.value) {
     forcedColors = true
     applyPropertyFilter()
     return
diff --git a/packages/frontend-2/components/viewer/explorer/TreeItem.vue b/packages/frontend-2/components/viewer/explorer/TreeItem.vue
index e34495df7..c9704bce5 100644
--- a/packages/frontend-2/components/viewer/explorer/TreeItem.vue
+++ b/packages/frontend-2/components/viewer/explorer/TreeItem.vue
@@ -144,7 +144,7 @@ import type {
   ExplorerNode,
   SpeckleObject,
   SpeckleReference
-} from '~~/lib/common/helpers/sceneExplorer'
+} from '~~/lib/viewer/helpers/sceneExplorer'
 import { useInjectedViewerState } from '~~/lib/viewer/composables/setup'
 import {
   getHeaderAndSubheaderForSpeckleObject,
diff --git a/packages/frontend-2/components/viewer/selection/Object.vue b/packages/frontend-2/components/viewer/selection/Object.vue
index 5fe966e91..aa2dcadfd 100644
--- a/packages/frontend-2/components/viewer/selection/Object.vue
+++ b/packages/frontend-2/components/viewer/selection/Object.vue
@@ -131,7 +131,7 @@
 /* eslint-disable @typescript-eslint/no-unsafe-member-access */
 import { ChevronDownIcon } from '@heroicons/vue/24/solid'
 import { ClipboardDocumentIcon } from '@heroicons/vue/24/outline'
-import type { SpeckleObject } from '~~/lib/common/helpers/sceneExplorer'
+import type { SpeckleObject } from '~~/lib/viewer/helpers/sceneExplorer'
 import { getHeaderAndSubheaderForSpeckleObject } from '~~/lib/object-sidebar/helpers'
 import { useInjectedViewerState } from '~~/lib/viewer/composables/setup'
 import { useHighlightedObjectsUtilities } from '~/lib/viewer/composables/ui'
diff --git a/packages/frontend-2/lib/common/helpers/sceneExplorer.ts b/packages/frontend-2/lib/common/helpers/sceneExplorer.ts
deleted file mode 100644
index 2f2a812c5..000000000
--- a/packages/frontend-2/lib/common/helpers/sceneExplorer.ts
+++ /dev/null
@@ -1,15 +0,0 @@
-import { type SpeckleObject, type SpeckleReference } from '@speckle/viewer'
-
-// Note: minor typing hacks for less squiggly lines in the explorer.
-// TODO: ask alex re viewer data tree types
-
-export type ExplorerNode = {
-  guid?: string
-  data?: SpeckleObject
-  raw?: SpeckleObject
-  atomic?: boolean
-  model?: Record<string, unknown> & { id?: string }
-  children: ExplorerNode[]
-}
-
-export type { SpeckleObject, SpeckleReference }
diff --git a/packages/frontend-2/lib/core/composables/error.ts b/packages/frontend-2/lib/core/composables/error.ts
index 1f97fca50..c7355eaad 100644
--- a/packages/frontend-2/lib/core/composables/error.ts
+++ b/packages/frontend-2/lib/core/composables/error.ts
@@ -1,9 +1,10 @@
 import { useScopedState } from '~~/lib/common/composables/scopedState'
 import * as Observability from '@speckle/shared/dist/esm/observability/index'
-import type {
-  AbstractErrorHandler,
-  AbstractErrorHandlerParams,
-  AbstractUnhandledErrorHandler
+import {
+  prettify,
+  type AbstractErrorHandler,
+  type AbstractErrorHandlerParams,
+  type AbstractUnhandledErrorHandler
 } from '~/lib/core/helpers/observability'
 
 const ENTER_STATE_AT_ERRORS_PER_MIN = 100
@@ -65,7 +66,11 @@ export const useGetErrorLoggingTransports = () => {
 export const useLogToErrorLoggingTransports = () => {
   const transports = useGetErrorLoggingTransports()
   const invokeTransportsWithPayload = (payload: AbstractErrorHandlerParams) => {
-    transports.forEach((handler) => handler.onError(payload))
+    transports.forEach((handler) =>
+      handler.onError(payload, {
+        prettifyMessage: (msg) => prettify(payload.otherData || {}, msg)
+      })
+    )
   }
 
   return {
diff --git a/packages/frontend-2/lib/core/configs/apollo.ts b/packages/frontend-2/lib/core/configs/apollo.ts
index 997571498..d5deb8d9c 100644
--- a/packages/frontend-2/lib/core/configs/apollo.ts
+++ b/packages/frontend-2/lib/core/configs/apollo.ts
@@ -8,7 +8,7 @@ import createUploadLink from 'apollo-upload-client/createUploadLink.mjs'
 import { WebSocketLink } from '@apollo/client/link/ws'
 import { getMainDefinition } from '@apollo/client/utilities'
 import { Kind } from 'graphql'
-import type { OperationDefinitionNode } from 'graphql'
+import type { GraphQLError, OperationDefinitionNode } from 'graphql'
 import type { CookieRef, NuxtApp } from '#app'
 import type { Optional } from '@speckle/shared'
 import { useAuthCookie } from '~~/lib/auth/composables/auth'
@@ -22,7 +22,7 @@ import { onError } from '@apollo/client/link/error'
 import { useNavigateToLogin, loginRoute } from '~~/lib/common/helpers/route'
 import { useAppErrorState } from '~~/lib/core/composables/error'
 import { isInvalidAuth } from '~~/lib/common/helpers/graphql'
-import { isBoolean, omit } from 'lodash-es'
+import { isArray, isBoolean, omit } from 'lodash-es'
 import { useRequestId } from '~/lib/core/composables/server'
 
 const appName = 'frontend-2'
@@ -337,12 +337,15 @@ function createLink(params: {
       ? skipLoggingErrors
       : skipLoggingErrors?.(res)
     if (!isSubTokenMissingError && !shouldSkip) {
-      const errMsg = res.networkError?.message || res.graphQLErrors?.[0]?.message
+      const gqlErrors: Array<GraphQLError> = isArray(res.graphQLErrors)
+        ? res.graphQLErrors
+        : []
+      const errMsg = res.networkError?.message || gqlErrors[0]?.message
       logger.error(
         {
           ...omit(res, ['forward', 'response']),
           networkErrorMessage: res.networkError?.message,
-          gqlErrorMessages: res.graphQLErrors?.map((e) => e.message),
+          gqlErrorMessages: gqlErrors.map((e) => e.message),
           errorMessage: errMsg,
           graphql: true
         },
diff --git a/packages/frontend-2/lib/core/helpers/observability.ts b/packages/frontend-2/lib/core/helpers/observability.ts
index 2a82f0ae9..b2aa8bf58 100644
--- a/packages/frontend-2/lib/core/helpers/observability.ts
+++ b/packages/frontend-2/lib/core/helpers/observability.ts
@@ -19,7 +19,7 @@ import type { Logger } from 'pino'
 /**
  * Add pino-pretty like formatting
  */
-const prettify = (log: object, msg: string) =>
+export const prettify = (log: object, msg: string) =>
   msg.replace(/{([^{}]+)}/g, (match: string, p1: string) => {
     const val = get(log, p1)
     if (val === undefined) return match
@@ -33,7 +33,7 @@ const prettify = (log: object, msg: string) =>
  * Wrap any logger call w/ logic that prettifies the error message like pino-pretty does
  * and emits bindings if they are provided
  */
-const log =
+const prettifiedLoggerFactory =
   (logger: (...args: unknown[]) => void, bindings?: () => Record<string, unknown>) =>
   (...vals: unknown[]) => {
     const finalVals = vals.slice()
@@ -72,16 +72,16 @@ export function buildFakePinoLogger(
   const errLogger = (...args: unknown[]) => {
     const { onError } = options || {}
     if (onError) onError(...args)
-    log(console.error, bindings)(...args)
+    prettifiedLoggerFactory(console.error, bindings)(...args)
   }
 
   const logger = {
-    debug: log(console.debug, bindings),
-    info: log(console.info, bindings),
-    warn: log(console.warn, bindings),
+    debug: prettifiedLoggerFactory(console.debug, bindings),
+    info: prettifiedLoggerFactory(console.info, bindings),
+    warn: prettifiedLoggerFactory(console.warn, bindings),
     error: errLogger,
     fatal: errLogger,
-    trace: log(console.trace, bindings),
+    trace: prettifiedLoggerFactory(console.trace, bindings),
     silent: noop
   } as unknown as ReturnType<typeof Observability.getLogger>
 
@@ -121,13 +121,18 @@ export const formatAppError = (err: SimpleError) => {
   }
 }
 
-export type AbstractErrorHandler = (params: {
-  args: unknown[]
-  firstString: Optional<string>
-  firstError: Optional<Error>
-  otherData: Record<string, unknown>
-  nonObjectOtherData: unknown[]
-}) => void
+export type AbstractErrorHandler = (
+  params: {
+    args: unknown[]
+    firstString: Optional<string>
+    firstError: Optional<Error>
+    otherData: Record<string, unknown>
+    nonObjectOtherData: unknown[]
+  },
+  helpers: {
+    prettifyMessage: (msg: string) => string
+  }
+) => void
 
 export type AbstractUnhandledErrorHandler = (params: {
   event: ErrorEvent | PromiseRejectionEvent
@@ -175,13 +180,16 @@ export function enableCustomErrorHandling(params: {
               {},
               ...otherDataObjects
             ) as Record<string, unknown>
-            onError({
-              args,
-              firstError,
-              firstString,
-              otherData: mergedOtherDataObject,
-              nonObjectOtherData: otherDataNonObjects
-            })
+            onError(
+              {
+                args,
+                firstError,
+                firstString,
+                otherData: mergedOtherDataObject,
+                nonObjectOtherData: otherDataNonObjects
+              },
+              { prettifyMessage: (msg) => prettify(mergedOtherDataObject, msg) }
+            )
           }
 
           return log(...args)
diff --git a/packages/frontend-2/lib/object-sidebar/helpers.ts b/packages/frontend-2/lib/object-sidebar/helpers.ts
index c74e4d17e..0847a0c93 100644
--- a/packages/frontend-2/lib/object-sidebar/helpers.ts
+++ b/packages/frontend-2/lib/object-sidebar/helpers.ts
@@ -1,4 +1,4 @@
-import type { SpeckleObject } from '~~/lib/common/helpers/sceneExplorer'
+import type { SpeckleObject } from '~/lib/viewer/helpers/sceneExplorer'
 
 export type HeaderSubheader = {
   header: string
diff --git a/packages/frontend-2/lib/viewer/composables/setup.ts b/packages/frontend-2/lib/viewer/composables/setup.ts
index 5bf8cd0d0..529bebf48 100644
--- a/packages/frontend-2/lib/viewer/composables/setup.ts
+++ b/packages/frontend-2/lib/viewer/composables/setup.ts
@@ -49,7 +49,7 @@ import { nanoid } from 'nanoid'
 import { ToastNotificationType, useGlobalToast } from '~~/lib/common/composables/toast'
 import type { CommentBubbleModel } from '~~/lib/viewer/composables/commentBubbles'
 import { setupUrlHashState } from '~~/lib/viewer/composables/setup/urlHashState'
-import type { SpeckleObject } from '~~/lib/common/helpers/sceneExplorer'
+import type { SpeckleObject } from '~/lib/viewer/helpers/sceneExplorer'
 import type { Box3 } from 'three'
 import { Vector3 } from 'three'
 import { writableAsyncComputed } from '~~/lib/common/composables/async'
diff --git a/packages/frontend-2/lib/viewer/composables/setup/selection.ts b/packages/frontend-2/lib/viewer/composables/setup/selection.ts
index 172c4d64e..9459bc033 100644
--- a/packages/frontend-2/lib/viewer/composables/setup/selection.ts
+++ b/packages/frontend-2/lib/viewer/composables/setup/selection.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/no-unsafe-member-access */
 
 import { MeasurementType } from '@speckle/viewer'
-import type { SpeckleObject } from '~~/lib/common/helpers/sceneExplorer'
+import type { SpeckleObject } from '~/lib/viewer/helpers/sceneExplorer'
 import { useMixpanel } from '~~/lib/core/composables/mp'
 import { useInjectedViewerState } from '~~/lib/viewer/composables/setup'
 import { useCameraUtilities, useSelectionUtilities } from '~~/lib/viewer/composables/ui'
diff --git a/packages/frontend-2/lib/viewer/composables/ui.ts b/packages/frontend-2/lib/viewer/composables/ui.ts
index 3332c42c4..328a0036c 100644
--- a/packages/frontend-2/lib/viewer/composables/ui.ts
+++ b/packages/frontend-2/lib/viewer/composables/ui.ts
@@ -4,7 +4,7 @@ import { CameraController, MeasurementsExtension } from '@speckle/viewer'
 import { until } from '@vueuse/shared'
 import { difference, isString, uniq } from 'lodash-es'
 import { useEmbedState } from '~/lib/viewer/composables/setup/embed'
-import type { SpeckleObject } from '~~/lib/common/helpers/sceneExplorer'
+import type { SpeckleObject } from '~/lib/viewer/helpers/sceneExplorer'
 import { isNonNullable } from '~~/lib/common/helpers/utils'
 import {
   useInjectedViewer,
diff --git a/packages/frontend-2/lib/viewer/composables/viewer.ts b/packages/frontend-2/lib/viewer/composables/viewer.ts
index 9cd5424a9..a329ddff4 100644
--- a/packages/frontend-2/lib/viewer/composables/viewer.ts
+++ b/packages/frontend-2/lib/viewer/composables/viewer.ts
@@ -16,7 +16,7 @@ import {
   type SelectionEvent,
   type TreeNode
 } from '@speckle/viewer'
-import type { SpeckleObject } from '~~/lib/common/helpers/sceneExplorer'
+import type { SpeckleObject } from '~/lib/viewer/helpers/sceneExplorer'
 
 // NOTE: this is a preformance optimisation - this function is hot, and has to do
 // potentially large searches if many elements are hidden/isolated. We cache the
diff --git a/packages/frontend-2/lib/viewer/helpers/sceneExplorer.ts b/packages/frontend-2/lib/viewer/helpers/sceneExplorer.ts
new file mode 100644
index 000000000..50db63f29
--- /dev/null
+++ b/packages/frontend-2/lib/viewer/helpers/sceneExplorer.ts
@@ -0,0 +1,29 @@
+import type { MaybeNullOrUndefined } from '@speckle/shared'
+import {
+  type NumericPropertyInfo,
+  type PropertyInfo,
+  type SpeckleObject,
+  type SpeckleReference,
+  type StringPropertyInfo
+} from '@speckle/viewer'
+
+export const isStringPropertyInfo = (
+  info: MaybeNullOrUndefined<PropertyInfo>
+): info is StringPropertyInfo => info?.type === 'string'
+export const isNumericPropertyInfo = (
+  info: MaybeNullOrUndefined<PropertyInfo>
+): info is NumericPropertyInfo => info?.type === 'number'
+
+// Note: minor typing hacks for less squiggly lines in the explorer.
+// TODO: ask alex re viewer data tree types
+
+export type ExplorerNode = {
+  guid?: string
+  data?: SpeckleObject
+  raw?: SpeckleObject
+  atomic?: boolean
+  model?: Record<string, unknown> & { id?: string }
+  children: ExplorerNode[]
+}
+
+export type { SpeckleObject, SpeckleReference }
diff --git a/packages/frontend-2/plugins/001-logger.ts b/packages/frontend-2/plugins/001-logger.ts
index 633368f62..bab646709 100644
--- a/packages/frontend-2/plugins/001-logger.ts
+++ b/packages/frontend-2/plugins/001-logger.ts
@@ -136,6 +136,10 @@ export default defineNuxtPlugin(async (nuxtApp) => {
       ...collectMainInfo({ isBrowser: true })
     })
 
+    logger = buildFakePinoLogger({
+      consoleBindings: logCsrEmitProps ? collectCoreInfo : undefined
+    })
+
     // SEQ Browser integration
     if (logClientApiToken?.length && logClientApiEndpoint?.length) {
       const seq = await import('seq-logging/browser')
@@ -195,24 +199,15 @@ export default defineNuxtPlugin(async (nuxtApp) => {
         })
       }
       errorHandlers.push(errorLogger)
-
-      logger = buildFakePinoLogger({
-        consoleBindings: logCsrEmitProps ? collectCoreInfo : undefined
-      })
       logger.debug('Set up seq ingestion...')
-    } else {
-      // No seq integration, fallback to basic console logging
-      logger = buildFakePinoLogger({
-        consoleBindings: logCsrEmitProps ? collectCoreInfo : undefined
-      })
     }
   }
 
   // Register seq transports, if any
   if (errorHandlers.length) {
     registerErrorTransport({
-      onError: (params) => {
-        errorHandlers.forEach((handler) => handler(params))
+      onError: (...params) => {
+        errorHandlers.forEach((handler) => handler(...params))
       },
       onUnhandledError: (event) => {
         unhandledErrorHandlers.forEach((handler) => handler(event))
@@ -220,19 +215,19 @@ export default defineNuxtPlugin(async (nuxtApp) => {
     })
   }
 
-  // Global error handler - handle all transports
+  // Global error handler - handle all transports besides the core pino/console.log logger
   const transports = useGetErrorLoggingTransports()
   let serverFatalError: Optional<AbstractErrorHandlerParams> = undefined
   logger = enableCustomErrorHandling({
     logger,
-    onError: (params) => {
+    onError: (params, helpers) => {
       const { otherData } = params
 
       if (import.meta.server && otherData?.isAppError) {
         serverFatalError = params
       }
 
-      transports.forEach((handler) => handler.onError(params))
+      transports.forEach((handler) => handler.onError(params, helpers))
     }
   })
 
diff --git a/packages/frontend-2/plugins/002-rum.ts b/packages/frontend-2/plugins/002-rum.ts
index 490287ae6..91089625f 100644
--- a/packages/frontend-2/plugins/002-rum.ts
+++ b/packages/frontend-2/plugins/002-rum.ts
@@ -7,6 +7,7 @@ import type { Plugin } from 'nuxt/dist/app/nuxt'
 import { isH3Error } from '~/lib/common/helpers/error'
 import { useRequestId, useServerRequestId } from '~/lib/core/composables/server'
 import { isBrave, isSafari } from '@speckle/shared'
+import { isString } from 'lodash-es'
 
 type PluginNuxtApp = Parameters<Plugin>[0]
 
@@ -69,15 +70,28 @@ function initRumClient(app: PluginNuxtApp) {
           : {}
 
       registerErrorTransport({
-        onError: ({ args, firstError, firstString, otherData, nonObjectOtherData }) => {
+        onError: (
+          { args, firstError, firstString, otherData, nonObjectOtherData },
+          { prettifyMessage }
+        ) => {
           if (!datadog || !('addError' in datadog)) return
 
-          const error = firstError || firstString || args[0]
+          let error = firstError || firstString || args[0]
+          const mainErrorMessageTemplate = firstString
+          const mainErrorMessage = mainErrorMessageTemplate
+            ? prettifyMessage(mainErrorMessageTemplate)
+            : undefined
+
+          if (isString(error)) {
+            error = prettifyMessage(error)
+          }
+
           datadog.addError(error, {
             ...otherData,
             ...resolveH3Data(firstError),
             extraData: nonObjectOtherData,
-            mainErrorMessage: firstString,
+            mainErrorMessageTemplate,
+            mainErrorMessage,
             isProperlySentError: true
           })
         },