diff --git a/core/picker.py b/core/picker.py
index d5630f1..1af7bef 100644
--- a/core/picker.py
+++ b/core/picker.py
@@ -736,8 +736,11 @@ def get_picker_path(rig, source, start=None):
 
 
 def pack_picker(rig, start=None):
+    if not 'rig_picker' in rig.data:
+        return
+
     pickers = []
-    for picker_source in rig.data.get('rig_picker', {}).get('sources', {}):
+    for picker_source in rig.data['rig_picker'].get('sources', []):
         picker_path = get_picker_path(rig, picker_source['source'], start)
         if not picker_path.exists():
             print(f'{picker_path} not exists')