Trying to evolve cartographer - crashing the game - and you can't evolve it enymore

Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at bwq.a(SourceFile:137)
	at bpu.a(SourceFile:99)
	at uf.a(SourceFile:793)
	at apv$h.a(SourceFile:1030)
	at apv.dM(SourceFile:560)
	at apv.H(SourceFile:245)
	at agm.cR(SourceFile:613)
	at agl.k(SourceFile:2031)
	at agm.k(SourceFile:474)
	at afz.k(SourceFile:134)
	at agl.S_(SourceFile:1882)
	at agm.S_(SourceFile:285)
	at bae.a(SourceFile:1163)
	at uf.a(SourceFile:380)
	at bae.g(SourceFile:1143)
	at bae.n_(SourceFile:1025)
	at uf.n_(SourceFile:296)
	at net.minecraft.server.MinecraftServer.b(SourceFile:773)
	at net.minecraft.server.MinecraftServer.a(SourceFile:702)
	at dng.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:568)
	at java.lang.Thread.run(Thread.java:745)