diff --git a/modules/ui_extra_networks_checkpoints.py b/modules/ui_extra_networks_checkpoints.py
index ebb5249f714..ca6c26076f9 100644
--- a/modules/ui_extra_networks_checkpoints.py
+++ b/modules/ui_extra_networks_checkpoints.py
@@ -30,7 +30,8 @@ def create_item(self, name, index=None, enable_filter=True):
         }
 
     def list_items(self):
-        for index, name in enumerate(sd_models.checkpoints_list):
+        names = list(sd_models.checkpoints_list)
+        for index, name in enumerate(names):
             yield self.create_item(name, index)
 
     def allowed_directories_for_previews(self):