Play offline crashes on launch

When not connected to the internet, the "Play Offline" version fails to launch the game, This has so far been confirmed on two machines with similar setups.

When connected to the internet the game launches fine.

Please fix this, I run LAN a server that is not always connected to the internet and play MC with family. Due to the nature of the server, internet connection it is undesirable.

The current work around is to connect to the internet individually on each client machine and then switch connection to the private network after launch, but this is not ideal and doesn't solve the problem that the "Play Offline" button doesn't do what it says on the tin.

Hopefully not a duplicate, the only issue i found matching this one was from a really old version.