diff --git a/oslo_service/eventlet_backdoor.py b/oslo_service/eventlet_backdoor.py
index 83908055..ada9a938 100644
--- a/oslo_service/eventlet_backdoor.py
+++ b/oslo_service/eventlet_backdoor.py
@@ -86,7 +86,8 @@ def _detailed_dump_frames(f, thread_index):
 
 
 def _find_objects(t):
-    return [o for o in gc.get_objects() if isinstance(o, t)]
+    return [o for o in gc.get_objects()
+            if hasattr(o, "__class__") and isinstance(o, t)]
 
 
 def _capture_profile(fname=''):
diff --git a/releasenotes/notes/fix-find-object-in-backdoor-487bf78c4c502594.yaml b/releasenotes/notes/fix-find-object-in-backdoor-487bf78c4c502594.yaml
new file mode 100644
index 00000000..31c088ad
--- /dev/null
+++ b/releasenotes/notes/fix-find-object-in-backdoor-487bf78c4c502594.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fix the backdoor helper method fo() to also work when there are objects
+    present in the current python instance that do not have a __class__
+    attribute.