diff --git a/source/blender/blenkernel/intern/lib_override.cc b/source/blender/blenkernel/intern/lib_override.cc
index 12e03ae223a..11834c8507e 100644
--- a/source/blender/blenkernel/intern/lib_override.cc
+++ b/source/blender/blenkernel/intern/lib_override.cc
@@ -3619,8 +3619,11 @@ void BKE_lib_override_library_make_local(Main *bmain, ID *id)
   }
 
   /* In case a liboverride hierarchy root is 'made local', i.e. is not a liboverride anymore, all
-   * hierarchy roots of all liboverrides need to be validated/re-generated again. */
-  BKE_lib_override_library_main_hierarchy_root_ensure(bmain);
+   * hierarchy roots of all liboverrides need to be validated/re-generated again.
+   * Only in case `bmain` is given, otherwise caller is responsible to do this. */
+  if (bmain) {
+    BKE_lib_override_library_main_hierarchy_root_ensure(bmain);
+  }
 }
 
 /* We only build override GHash on request. */