Issue with listing NFTs on opensea - "approve collection"; "Cannot read properties of undefined (reading 'length')" "

Hello I’m having serious issues trying to list NFTs on opensea. It says:

“Approve Collection
Go to your wallet
You’ll be asked to approve this collection from your wallet. You only need to approve each collection once.”

I go to my MetaMask and it then says:

"MetaMask encountered an error

Try again by closing and reopening the popup, or contact support here.

Error details
Message: Cannot read properties of undefined (reading ‘length’)
Code: TypeError
TypeError: Cannot read properties of undefined (reading ‘length’)
and it goes on and on with chrome-extension links.

Any help would be much appreciated.

Hi @different, welcome to MetaMask community!

I would say you should make sure you are using the latest version of MetaMask, clearing your cache and cookies, and also try using a different browser.

If the issue persists, please reach out to MetaMask Support.

  • This will connect you to a bot at first, answer some questions and it will open a ticket for you with an agent.

Remember - NOBODY, including from support, will ask for your secret recovery phrase or for you to input it onto any website for confirmation.


This topic was automatically closed after 30 days. New replies are no longer allowed.