Merge branch '3.x'

1 files changed, 4 insertions, 1 deletions

diff --git a/sphinx/ext/autodoc/mock.py b/sphinx/ext/autodoc/mock.py
index e11f63559..513ce523f 100644
--- a/sphinx/ext/autodoc/mock.py
+++ b/sphinx/ext/autodoc/mock.py
@@ -153,7 +153,10 @@ def mock(modnames: List[str]) -> Generator[None, None, None]:
 def ismock(subject: Any) -> bool:
     """Check if the object is mocked."""
     # check the object has '__sphinx_mock__' attribute
-    if not hasattr(subject, '__sphinx_mock__'):
+    try:
+        if safe_getattr(subject, '__sphinx_mock__', None) is None:
+            return False
+    except AttributeError:
         return False
 
     # check the object is mocked module