diff --git a/app/database.py b/app/database.py
index 27a58c4..95be41e 100644
--- a/app/database.py
+++ b/app/database.py
@@ -149,7 +149,8 @@ def set_rfid_to_userid(rfid_ids, user_id):
         if not u: #rfid id is not assigned to a user, so it should be added
              add_rfid_id(rfid_id, user_id)
 
-    for old_rfid in get_rfid_ids_by_userid(user_id):
+    old_rfids = get_rfid_ids_by_userid(user_id).replace(" ","").split(";")
+    for old_rfid in old_rfids:
         if old_rfid not in new_rfids:
             query_db("DELETE FROM Rfid WHERE rfid_id = ?", (old_rfid, ))