The observer block updates crash the game in certain scenarios.

Using a relatively small redstone contraption the world crashes unexpectedly after use in quick succession. After reloading the world and updating the first block crashes it again without repeated use.

What I expected to happen was...:
There should have been multiple pistons moving up then down in a strait line with little or no lag.

What actually happened was
Minecraft crashed and continues to do so with relative ease.

Steps to Reproduce:
1. Build the contraption shown.
2. click the lever by the input around 5 times in quick succession.

Description: Ticking block entity

java.lang.IllegalArgumentException: Cannot get property att{name=facing, clazz=class cv, values=[down, up, north, south, west, east]} as it does not exist in ath{block=minecraft:air, properties=[]}
	at ath$a.c(SourceFile:166)
	at ata.j(SourceFile:102)
	at ata.a(SourceFile:92)
	at ata.f(SourceFile:110)
	at ata.F_(SourceFile:233)
	at ajn.k(SourceFile:1429)
	at ben.t(SourceFile:1649)
	at ben.av(SourceFile:967)
	at ben.a(SourceFile:395)
	at net.minecraft.client.main.Main.main(SourceFile:124)