Game crashing once in a while

[Kaitaro]

Hello! Since yesterday my game keeps crashing when playing on a server around every 40-60 minutes. The error says "The game crashed whilst unexpected error Error: java.lang.IllegalArgumentException: Illegal base64 character 3b Exit Code: -1" I play on 1.8.9 Is there any way to fix it? Since i can't find anything on google that helps.

[Luis_ST]

1.8 is no longer supported on this forum.
Please update to a modern version of Minecraft to receive support.