Add non-module argument guard in fetch_class_library_tuple

b/src/diffusers/pipelines/pipeline_loading_utils.py

@@ -0,0 +1,11 @@
+
+
+def _fetch_class_library_tuple(module):
+    # Guard against non-module values (bool, int, str, etc.) that can be passed
+    # when a positional argument shift occurs in subclasses (e.g. issue #6969).
+    if not isinstance(module, (torch.nn.Module, type)):
+        return (None, None)
+
+    # import it here to avoid circular import
+    diffusers_module = importlib.import_module(__name__.split(".")[0])
+    pipelines = getattr(diffusers_module, "pipelines")

src/diffusers/pipelines/pipeline_loading_utils.py

@@ -952,6 +952,11 @@ def _get_load_method(class_obj: object, load_method_name: str, is_dduf: bool) ->
 
 
 def _fetch_class_library_tuple(module):
+    # Guard against non-module values (bool, int, str, etc.) that can be passed
+    # when a positional argument shift occurs in subclasses (e.g. issue #6969).
+    if not isinstance(module, (torch.nn.Module, type)):
+        return (None, None)
+
     # import it here to avoid circular import
     diffusers_module = importlib.import_module(__name__.split(".")[0])
     pipelines = getattr(diffusers_module, "pipelines")