When a player joins a server it crashes the whole server on join error on RecipeServerBook.

 

net.minecraft.server.v1_12_R1.ReportedException: Ticking player
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:825) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45-internal]
Caused by: java.lang.NullPointerException
at net.minecraft.server.v1_12_R1.RecipeBookServer.a(SourceFile:27) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.a(EntityPlayer.java:989) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.a(EntityPlayer.java:1003) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.AdvancementRewards.a(AdvancementRewards.java:62) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.AdvancementDataPlayer.grantCriteria(AdvancementDataPlayer.java:204) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.CriterionTrigger$a.a(SourceFile:31) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.CriterionTriggerInventoryChanged$a.a(SourceFile:158) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.CriterionTriggerInventoryChanged.a(SourceFile:69) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.a(EntityPlayer.java:893) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.Container.b(Container.java:84) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.B_(EntityPlayer.java:260) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1638) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.World.h(World.java:1608) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.WorldServer.l(WorldServer.java:640) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1402) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:617) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:814) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
... 4 more
[21:13:42] [Server thread/ERROR]: Cause of unexpected exception was
java.lang.NullPointerException: null
at net.minecraft.server.v1_12_R1.RecipeBookServer.a(SourceFile:27) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.a(EntityPlayer.java:989) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.a(EntityPlayer.java:1003) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.AdvancementRewards.a(AdvancementRewards.java:62) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.AdvancementDataPlayer.grantCriteria(AdvancementDataPlayer.java:204) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.CriterionTrigger$a.a(SourceFile:31) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.CriterionTriggerInventoryChanged$a.a(SourceFile:158) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.CriterionTriggerInventoryChanged.a(SourceFile:69) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.a(EntityPlayer.java:893) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.Container.b(Container.java:84) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.EntityPlayer.B_(EntityPlayer.java:260) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1638) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.World.h(World.java:1608) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.WorldServer.l(WorldServer.java:640) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1402) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:617) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:814) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) ~[ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [ivory_dev.jar:git-Spigot-ede465d-bb4ae3b]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45-internal]