diff --git a/source/blender/blenkernel/intern/material.c b/source/blender/blenkernel/intern/material.c
index 59a51436b7b..3ea6dd3d735 100644
--- a/source/blender/blenkernel/intern/material.c
+++ b/source/blender/blenkernel/intern/material.c
@@ -900,9 +900,15 @@ void BKE_objects_materials_test_all(Main *bmain, ID *id)
   }
 
   BKE_main_lock(bmain);
+  int processed_objects = 0;
   for (ob = bmain->objects.first; ob; ob = ob->id.next) {
     if (ob->data == id) {
       BKE_object_material_resize(bmain, ob, *totcol, false);
+      processed_objects++;
+      BLI_assert(processed_objects <= id->us && processed_objects > 0);
+      if (processed_objects == id->us) {
+        break;
+      }
     }
   }
   BKE_main_unlock(bmain);