fix typecheck error

pydantic · Jan 8, 2024 · b68e7e3 · b68e7e3
1 parent fe4b809
commit b68e7e3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/pydantic/_internal/_fields.py b/pydantic/_internal/_fields.py
@@ -266,7 +266,7 @@ def collect_dataclass_fields(
 
     source_module = sys.modules.get(cls.__module__)
     if source_module is not None:
-        types_namespace = {**source_module.__dict__, **types_namespace}
+        types_namespace = {**source_module.__dict__, **(types_namespace or {})}
 
     for ann_name, dataclass_field in dataclass_fields.items():
         ann_type = _typing_extra.eval_type_lenient(dataclass_field.type, types_namespace, cls_localns)