diff --git a/src/apollo-provider.js b/src/apollo-provider.js
index 45a6fd1..5799c6b 100644
--- a/src/apollo-provider.js
+++ b/src/apollo-provider.js
@@ -4,7 +4,9 @@ export class ApolloProvider {
       throw new Error('Options argument required')
     }
     this.clients = options.clients || {}
-    this.clients.defaultClient = this.defaultClient = options.defaultClient
+    if (options.defaultClient) {
+      this.clients.defaultClient = this.defaultClient = options.defaultClient
+    }
     this.defaultOptions = options.defaultOptions
     this.watchLoading = options.watchLoading
     this.errorHandler = options.errorHandler