diff --git a/app.py b/app.py
index 59d11f5..da8c8ed 100644
--- a/app.py
+++ b/app.py
@@ -834,6 +834,7 @@ def handle_edit_item(data):
 
 @socketio.on('join_list')
 def handle_join(data):
+    global active_users
     room = str(data['room'])
     username = data.get('username', 'Gość')
     join_room(room)
@@ -851,6 +852,7 @@ def handle_join(data):
 
 @socketio.on('disconnect')
 def handle_disconnect():
+    global active_users
     for room, users in active_users.items():
         if current_user.username in users:
             users.remove(current_user.username)