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How to fix 'No chain ID defined' error in MetaMask

You could also see the following error messages:

  • Root Error: Missing chain id
  • Root Error: Invalid chain ID

If you manually added the network to MetaMask, head to Settings > Networks and make sure the chain ID associated with the network is the correct one. To find a chain ID, you could head to Chainlist, which maintains a catalogue of EVM-compatible networks and their details, or search for the relevant documentation of the network itself.

If you are using Ethereum Mainnet, try toggling networks: switch from Ethereum Mainnet to another network, and then back again.

Make sure you are also running the latest version of MetaMask.

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What is this?
This is a trial feedback system that uses Verax to record your feedback as onchain attestations on Linea Mainnet. When you vote, submit a transaction in your wallet.