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MC-116926

Advancement file containing only "null" crashes server

The bug

Providing an advancement which only contains null crashes the server when loading the world.

[^crash-2017-05-02_21.32.11-server.txt]

Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
	at j.a(SourceFile:64)
	at my.a(SourceFile:74)
	at my.<init>(SourceFile:66)
	at nt.b(SourceFile:162)
	at cgc.a(SourceFile:98)
	at cgc.j(SourceFile:130)
	at net.minecraft.server.MinecraftServer.run(SourceFile:436)
	at java.lang.Thread.run(Unknown Source)

Linked issues

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marcono1234

Nathan Adams

Confirmed

advancement, crash, null, null-pointer-exception, server

Minecraft 17w17b, Minecraft 17w18b

Minecraft 1.12 Pre-Release 3

Retrieved