[MC-150330] When I break blocks they don't drop, and it crashes shortly after.

When I break blocks they don't drop, the mobs don't move, and it crashes shortly after I log into a world. Please help!

The crash report is under attachments:

1.14: mc-150330-crash-report.txt

java.lang.StackOverflowError: Exception ticking world
	at com.google.common.collect.ImmutableMap.copyOf(ImmutableMap.java:391)
	at col.<init>(SourceFile:47)
	at col.<init>(SourceFile:25)
	at col$a.a(SourceFile:197)
	at bml.a(SourceFile:609)
	at bvj.a(SourceFile:278)
	at bml.a(SourceFile:622)
	at bml.a(SourceFile:651)
	at bhh.b(SourceFile:296)
	at bml.a(SourceFile:208)
	at bml.a(SourceFile:183)
	at bvj.a(SourceFile:246)
	at bhh.a(SourceFile:248)
	at bhh.b(SourceFile:298)
	at bml.a(SourceFile:208)
	at bml.a(SourceFile:183)
	at bvj.a(SourceFile:246)
	at bhh.a(SourceFile:248)
	at bhh.b(SourceFile:298)
	...