ConcurrentModificationException when placing custom player head

When placing down a custom player head (I don't know if it also crashes when placing down other blocks), it crashes the game.

19w34a\: [^crash-2019-08-22_13.43.11-client.txt]

Description: Unexpected error

java.util.ConcurrentModificationException
	at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:966)
	at java.util.LinkedList$ListItr.next(LinkedList.java:888)
	at com.google.common.collect.Iterators$8.next(Iterators.java:896)
	at com.google.common.collect.Iterators.addAll(Iterators.java:367)
	at com.google.common.collect.Lists.newArrayList(Lists.java:165)
	at yq.a(SourceFile:214)
	at yq.c(SourceFile:198)
	at yq.a(SourceFile:146)
	at bvx.b(SourceFile:124)
	at bvx.f(SourceFile:108)
	at bvx.a(SourceFile:104)
	at brs.a(SourceFile:45)
	at bbn.a(SourceFile:81)
	at bbn.a(SourceFile:41)
	at bdl.a(SourceFile:190)
	at dls.a(SourceFile:324)
	at czo.aH(SourceFile:1325)
	at czo.aI(SourceFile:1552)
	at czo.o(SourceFile:1401)
	at czo.e(SourceFile:912)
	at czo.b(SourceFile:402)
	at net.minecraft.client.main.Main.main(SourceFile:194)