Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> 216b7f371372ec6ed061d12d6e5f49f63cf0da44d323b3a335669462eb5c99db:10:15
   |
10 |                ref.removeViewPermission(id: tokenId, address :userEthAddress)
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: unexpectedly found nil while forcing an Optional value
   --> ea11c7f74551df98.Certifily:264:23
    |
264 |             let ref = (&self.ownedNFTs[id] as auth &NonFungibleToken.NFT?)!
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^