[MC-45933] Crash while sleeping

1.Start a dedicated server
2. join dedicated server
3. have approximately 213 entities on server
4. sleep

Description: Unexpected error

java.lang.NullPointerException: Unexpected error
	at bjw.a(SourceFile:486)
	at hg.a(SourceFile:47)
	at hg.a(SourceFile:12)
	at ef.a(SourceFile:164)
	at bjz.e(SourceFile:212)
	at azi.p(SourceFile:1286)
	at azi.ah(SourceFile:760)
	at azi.f(SourceFile:711)
	at net.minecraft.client.main.Main.main(SourceFile:152)