diff --git a/datastore/providers/chroma_datastore.py b/datastore/providers/chroma_datastore.py
index 59b802d63..af16bb141 100644
--- a/datastore/providers/chroma_datastore.py
+++ b/datastore/providers/chroma_datastore.py
@@ -245,6 +245,8 @@ async def delete(
                 }
         elif filter:
             where_clause = self._where_from_query_filter(filter)
+        else:
+            where_clause = None
 
         self._collection.delete(where=where_clause)
         return True