diff --git a/posthog/hogql_queries/insights/trends/trends_query_runner.py b/posthog/hogql_queries/insights/trends/trends_query_runner.py
index c75970d401d2d..ba5cc3acf4d53 100644
--- a/posthog/hogql_queries/insights/trends/trends_query_runner.py
+++ b/posthog/hogql_queries/insights/trends/trends_query_runner.py
@@ -721,12 +721,15 @@ def _event_property(
         group_type_index: Optional[int],
     ) -> str:
         try:
-            return PropertyDefinition.objects.get(
-                name=field,
-                team=self.team,
-                type=field_type,
-                group_type_index=group_type_index if field_type == PropertyDefinition.Type.GROUP else None,
-            ).property_type
+            return (
+                PropertyDefinition.objects.get(
+                    name=field,
+                    team=self.team,
+                    type=field_type,
+                    group_type_index=group_type_index if field_type == PropertyDefinition.Type.GROUP else None,
+                ).property_type
+                or "String"
+            )
         except PropertyDefinition.DoesNotExist:
             return "String"