diff --git a/src/specklepy/serialization/base_object_serializer.py b/src/specklepy/serialization/base_object_serializer.py
index acf11d7..3129ee6 100644
--- a/src/specklepy/serialization/base_object_serializer.py
+++ b/src/specklepy/serialization/base_object_serializer.py
@@ -72,7 +72,7 @@ class BaseObjectSerializer:
 
         return obj_id, ujson.dumps(obj)
 
-    def traverse_base(self, base: Base) -> Tuple[str, Dict]:
+    def traverse_base(self, base: Base) -> Tuple[str, Dict[str, Any]]:
         """Decomposes the given base object and builds a serializable dictionary
 
         Arguments:
@@ -213,6 +213,8 @@ class BaseObjectSerializer:
         Returns:
             Any -- a serializable version of the given object
         """
+        if obj is None:
+            return None
         if isinstance(obj, PRIMITIVES):
             return obj
 
diff --git a/tests/test_traverse_value.py b/tests/test_traverse_value.py
new file mode 100644
index 0000000..0068204
--- /dev/null
+++ b/tests/test_traverse_value.py
@@ -0,0 +1,25 @@
+from typing import List
+
+from specklepy.objects.base import Base
+from specklepy.serialization.base_object_serializer import BaseObjectSerializer
+
+
+class TestBase(Base):
+    foo: List[str]
+    bar: int
+
+
+def test_traverse_value():
+    base = TestBase(bar=1)
+    base.foo = [None]
+    serializer = BaseObjectSerializer()
+    object_id, object_dict = serializer.traverse_base(base)
+    assert object_dict == {
+        "id": object_id,
+        "speckle_type": "TestBase",
+        "applicationId": None,
+        "foo": [None],
+        "units": None,
+        "bar": 1,
+        "totalChildrenCount": 0,
+    }