Crash report:
https://gist.github.com/Devoev/c586be70fcb5435e8746bfb94b421075

Forge Version 12.18.3.2254

I'm running a modded Minecraft Server including Harvest Festival. But sometimes the game (the client, not the server) randomly crashes. You cant join the server, because it keeps crashing. Joining a singleplayer world seems to help.