diff --git a/heigh_ho/scripts/gizmo_buttons.py b/heigh_ho/scripts/gizmo_buttons.py
index c714de1137e9fccd31d595e69db8b0395902ebbf..9a7aad2fa243afdf8bb55e147d6c679951256b97 100644
--- a/heigh_ho/scripts/gizmo_buttons.py
+++ b/heigh_ho/scripts/gizmo_buttons.py
@@ -293,11 +293,18 @@ def knob_changed_write():
 
     group = nuke.thisNode()
     # stored parameter to check what changed
-    stored_write_data = ast.literal_eval(group["write_data"].value())
-    stored_render_path = stored_write_data["render_path"]
-    stored_render_name = stored_write_data["render_name"]
-    stored_review_path = stored_write_data["review_path"]
-    stored_review_name = stored_write_data["review_name"]
+    try:
+        stored_write_data = ast.literal_eval(group["write_data"].value())
+        stored_render_path = stored_write_data["render_path"]
+        stored_render_name = stored_write_data["render_name"]
+        stored_review_path = stored_write_data["review_path"]
+        stored_review_name = stored_write_data["review_name"]
+    except KeyError:
+        stored_render_path = ""
+        stored_render_name = ""
+        stored_review_path = ""
+        stored_review_name = ""
+
     # user parameters
     # settings
     mode = group['render_mode'].value()