diff --git a/spacy/util.py b/spacy/util.py
index f55b03db8..013c87acc 100644
--- a/spacy/util.py
+++ b/spacy/util.py
@@ -930,6 +930,8 @@ def is_same_func(func1: Callable, func2: Callable) -> bool:
     """
     if not callable(func1) or not callable(func2):
         return False
+    if not hasattr(func1,"__qualname__") or not hasattr(func2,"__qualname__"):
+        return False
     same_name = func1.__qualname__ == func2.__qualname__
     same_file = inspect.getfile(func1) == inspect.getfile(func2)
     same_code = inspect.getsourcelines(func1) == inspect.getsourcelines(func2)