The game crashes when I click multiplayer, log:
The game crashed whilst mouseclicked event handler
Error: java.lang.IllegalArgumentException: Non [a-z0-9_-] character in path
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duplicates 1
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Thank you for your report!
However, this issue is a Duplicate of MC-122140.
If you have additional information, please add it to that report.
Please search before reporting, as it's likely that one exists already.
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Can confirm on Windows 10 for 17w47a. I'll add an error report to this bug.