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  1. Minecraft: Java Edition
  2. MC-116927

Server crashes with "null" as advancement title or description value

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    • Confirmed

      The bug

      Setting the title or description of an advancement to null crashes the server.

      title-null-crash-2017-05-09_15.09.31-server.txt
      Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
	at i.<init>(SourceFile:51)
	at i$a.a(SourceFile:170)
	at j.a(SourceFile:65)
	at ng.a(SourceFile:74)
	at ng.<init>(SourceFile:66)
	at ob.b(SourceFile:162)
	at cgl.a(SourceFile:98)
	at cgl.j(SourceFile:130)
	at net.minecraft.server.MinecraftServer.run(SourceFile:436)
	at java.lang.Thread.run(Unknown Source)
      description-null-crash-2017-05-09_15.20.53-server.txt
      Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
	at gw.a(SourceFile:18)
	at i.<init>(SourceFile:54)
	at i$a.a(SourceFile:170)
	at j.a(SourceFile:65)
	at ng.a(SourceFile:74)
	at ng.<init>(SourceFile:66)
	at ob.b(SourceFile:162)
	at cgl.a(SourceFile:98)
	at cgl.j(SourceFile:130)
	at net.minecraft.server.MinecraftServer.run(SourceFile:436)
	at java.lang.Thread.run(Unknown Source)

      Note: It is likely that MC-87587 and MC-92867 can cause a crash as well.

      How to reproduce

      1. Download the attached advancement title_description_null.json and place it in the following directory of your world folder 
        data\advancements\custom
      2. Load the world

        1. description-null-crash-2017-05-09_15.20.53-server.txt
          1 kB
        2. title_description_null.json
          0.2 kB
        3. title-null-crash-2017-05-09_15.09.31-server.txt
          1 kB

            dinnerbone [Mojang] Nathan Adams
            marcono1234 [Mod] Marcono1234
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              Created:
              Updated:
              Resolved:
              CHK: