Transaction

[Error Code: 1101] error caused by: 1 error occurred:
	* transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed:
  --> a04535152bf256f694be663f1814ba6e94a50b5b8a1920e5af2b002e2b98ae0e: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?)!
    |                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^