diff --git a/scripts/modules/bpy_extras/anim_utils.py b/scripts/modules/bpy_extras/anim_utils.py
index 9fe51bf215e..cdd9c367f6c 100644
--- a/scripts/modules/bpy_extras/anim_utils.py
+++ b/scripts/modules/bpy_extras/anim_utils.py
@@ -243,11 +243,14 @@ def bake_action_iter(
         return clean_props
 
     def bake_custom_properties(obj, *, custom_props, frame, group_name=""):
+        import idprop
         if frame is None or not custom_props:
             return
         for key, value in custom_props.items():
             if key in obj.bl_rna.properties and not obj.bl_rna.properties[key].is_animatable:
                 continue
+            if isinstance(obj[key], idprop.types.IDPropertyGroup):
+                continue
             obj[key] = value
             if key in obj.bl_rna.properties:
                 rna_path = key