diff --git a/openbb_platform/core/openbb_core/app/static/package_builder.py b/openbb_platform/core/openbb_core/app/static/package_builder.py
index 5db17483a191..11fcc5766b0a 100644
--- a/openbb_platform/core/openbb_core/app/static/package_builder.py
+++ b/openbb_platform/core/openbb_core/app/static/package_builder.py
@@ -319,6 +319,8 @@ def get_function_hint_type_list(cls, func: Callable) -> List[Type]:
             hint_type_list.append(parameter.annotation)
 
         if return_type:
+            if not issubclass(return_type, OBBject):
+                raise ValueError("Return type must be an OBBject.")
             hint_type = get_args(get_type_hints(return_type)["results"])[0]
             hint_type_list.append(hint_type)