diff --git a/modules/ui_extra_networks_checkpoints.py b/modules/ui_extra_networks_checkpoints.py
index 360579b0..a6799171 100644
--- a/modules/ui_extra_networks_checkpoints.py
+++ b/modules/ui_extra_networks_checkpoints.py
@@ -34,5 +34,5 @@ class ExtraNetworksPageCheckpoints(ui_extra_networks.ExtraNetworksPage):
             }
 
     def allowed_directories_for_previews(self):
-        return [shared.cmd_opts.ckpt_dir, sd_models.model_path]
+        return [v for v in [shared.cmd_opts.ckpt_dir, sd_models.model_path] if v is not None]