diff --git a/utils/lol/utils.py b/utils/lol/utils.py
index 3dd6a611..6368bb7f 100644
--- a/utils/lol/utils.py
+++ b/utils/lol/utils.py
@@ -463,7 +463,7 @@ def link_asset(context, asset, location, rotation):
 
 
 def append_material(context, asset, target_object, target_slot):
-    if target_object == None:
+    if target_object == '':
         return
 
     user_preferences = get_addon_preferences(context)