[21:34:35] [main/INFO]: [STDERR]@.(null:-1): java.lang.NullPointerException
[21:34:35] [main/INFO]: [STDERR]@.(null:-1): 	at net.minecraft.server.v1_12_R1.AdvancementDataWorld.a(AdvancementDataWorld.java:157)
[21:34:35] [main/INFO]: [STDERR]@.(null:-1): 	at net.minecraft.server.v1_12_R1.AdvancementDataWorld.reload(AdvancementDataWorld.java:64)
[21:34:35] [main/INFO]: [STDERR]@.(null:-1): 	at net.minecraft.server.v1_12_R1.AdvancementDataWorld.<init>(AdvancementDataWorld.java:56)
[21:34:35] [main/INFO]: [STDERR]@.(null:-1): 	at net.minecraft.server.v1_12_R1.DispenserRegistry.c(DispenserRegistry.java:696)
[21:34:35] [main/INFO]: [STDERR]@.(null:-1): 	at net.minecraft.server.v1_12_R1.MinecraftServer.main(MinecraftServer.java:875)
[21:34:35] [main/INFO]: [STDERR]@.(null:-1): 	at org.bukkit.craftbukkit.Main.main(Main.java:194)