Revoke all method is not working

[mirkopezo]

nft-tutorial-js/src/nft-contract/approval.ts

Line 169 in 7695f16

if (token.approved_account_ids && Object.keys(token.approved_account_ids).length === 0 && Object.getPrototypeOf(token.approved_account_ids) === Object.prototype) {

There is mistake in code, instead of Object.keys(token.approved_account_ids).length === 0 it should be Object.keys(token.approved_account_ids).length !== 0.