Joining or inviting a person to a world crashes the game.

Thank you for your report!
However, this issue has been temporarily closed as Awaiting Response

Is this still an issue in the latest version? Either way, please add the affected version and/or let us know in a comment below.
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Expected Results:
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.

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