[MC-112023] Crash: Exception ticking world 'java.lang.ClassCastException: alk cannot be cast to amp'

Game crashes after running for a short while. The game should continue to run as normal but it doesn't. I'm actually not sure how to reproduce the problem but I did copy the crash report for you to look at.

Description: Exception ticking world

java.lang.ClassCastException: alk cannot be cast to amp
	at ayu$c.a(SourceFile:1848)
	at ayr.a(SourceFile:42)
	at ayn.a(SourceFile:95)
	at avx.b(SourceFile:437)
	at auo.a(SourceFile:803)
	at auo.a(SourceFile:791)
	at lv.c(SourceFile:115)
	at mb.a(SourceFile:85)
	at mc.c(SourceFile:147)
	at lw.d(SourceFile:221)
	at net.minecraft.server.MinecraftServer.D(SourceFile:626)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at cch.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	at java.lang.Thread.run(Thread.java:745)