Internal Server Error

{"message": "Odoo Server Error", "code": 200, "data": {"debug": "Traceback (most recent call last):\n File \"/opt/online/cores/online_o8r512/odoo/addons/web/controllers/main.py\", line 71, in wrap\n return f(*args, **kwargs)\n File \"/opt/online/cores/online_o8r512/odoo/addons/web/controllers/main.py\", line 1109, in saveas\n res = Model.read(cr, uid, [int(id)], fields, context)[0]\nIndexError: list index out of range\n", "message": "list index out of range", "name": "exceptions.IndexError", "arguments": ["list index out of range"]}}