The game crashes when reloading a world after a crash with a redstone clock with /particle mobappearence

When i used the command command /particle mobappearence ~ ~ ~ 1 1 1 1 100 @a, before the game has crashed and after when try to reload the world the game crashes and the following:

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]
Description: Unexpected error
java.lang.NullPointerException: Unexpected error
at ceb.a(SourceFile:7)
at ceg.b(SourceFile:32)
at cgt.a(SourceFile:14)
at cgt.a(SourceFile:12)
at cgt.b(SourceFile:974)
at bqn.ap(SourceFile:89)
at bqn.a(SourceFile:33)
at net.minecraft.client.main.Main.main(SourceFile:10)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
– Head –
Stacktrace:
at ceb.a(SourceFile:2)
at ceg.b(SourceFile:31)
at cgt.a(SourceFile:12)
at cgt.a(SourceFile:112)
Description: Post-rendering entity in world

java.lang.NullPointerException: Post-rendering entity in world
	at clz.b(SourceFile:29)
	at cly.a(SourceFile:20)
	at cly.a(SourceFile:2)
	at ceb.a(SourceFile:76)
	at ceg.b(SourceFile:31)
	at cgt.a(SourceFile:134)
	at cgt.a(SourceFile:22)
	at cgt.b(SourceFile:974)
	at bqn.ap(SourceFile:89)
	at bqn.a(SourceFile:303)
	at net.minecraft.client.main.Main.main(SourceFile:20)

Details:
	Entity Type: Guardian (aek)
	Entity ID: 681
	Entity Name: Guardian
	Entity's Exact location: 0.00, 0.00, 0.00
	Entity's Block location: 0.00,0.00,0.00 - World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 1,25,1), Region: (0,0; contains chunks 0,0 to 3,3, blocks 0,0,0 to 1,25,1)
	Entity's Momentum: 0.00, 0.00, 0.00
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~

(I acidently had a different crash report then the one needed, the new one is now the actual crash report for this crash.)