Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: unexpectedly found nil while forcing an Optional value
  --> 643db6d387044f422fd951e70c2665f6730ccdda74181740c123517d7da466ae:15:61
   |
15 |               .borrow<&{NonFungibleToken.CollectionPublic}>()!
   |                                                              ^