Major Hello,
2 players have tamed Parrots, then server crash.
I have zhorse plugin. Maybe this plugin set a nametag ?!
[10:31:59] [Server thread/INFO]: NozyGames has made the advancement [Best Friends Forever] [10:31:59] [Server thread/INFO]: Creepaster has made the advancement [Best Friends Forever] [10:32:10] [Server thread/ERROR]: Encountered an unexpected exception net.minecraft.server.v1_12_R1.ReportedException: Ticking entity at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:825) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot-1.12.jar:git-Spigot-7228328-14b597f] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131] Caused by: java.lang.NullPointerException: Null string not allowed at java.util.Objects.requireNonNull(Objects.java:228) ~[?:1.8.0_131] at net.minecraft.server.v1_12_R1.NBTTagString.<init>(SourceFile:22) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.NBTTagCompound.setString(SourceFile:141) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityPerchable.g(SourceFile:18) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.PathfinderGoalPerch.e(SourceFile:42) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.PathfinderGoalSelector.a(SourceFile:129) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityInsentient.doTick(EntityInsentient.java:654) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityLiving.n(EntityLiving.java:2090) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityInsentient.n(EntityInsentient.java:505) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityAgeable.n(EntityAgeable.java:158) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityAnimal.n(EntityAnimal.java:27) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityParrot.n(EntityParrot.java:88) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityLiving.B_(EntityLiving.java:1939) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityInsentient.B_(EntityInsentient.java:244) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityPerchable.B_(SourceFile:32) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1639) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.World.h(World.java:1609) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1435) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:665) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:814) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] ... 4 more [10:32:10] [Server thread/ERROR]: Cause of unexpected exception was java.lang.NullPointerException: Null string not allowed at java.util.Objects.requireNonNull(Objects.java:228) ~[?:1.8.0_131] at net.minecraft.server.v1_12_R1.NBTTagString.<init>(SourceFile:22) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.NBTTagCompound.setString(SourceFile:141) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityPerchable.g(SourceFile:18) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.PathfinderGoalPerch.e(SourceFile:42) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.PathfinderGoalSelector.a(SourceFile:129) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityInsentient.doTick(EntityInsentient.java:654) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityLiving.n(EntityLiving.java:2090) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityInsentient.n(EntityInsentient.java:505) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityAgeable.n(EntityAgeable.java:158) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityAnimal.n(EntityAnimal.java:27) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityParrot.n(EntityParrot.java:88) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityLiving.B_(EntityLiving.java:1939) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityInsentient.B_(EntityInsentient.java:244) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.EntityPerchable.B_(SourceFile:32) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1639) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.World.h(World.java:1609) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1435) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:665) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:814) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) ~[spigot-1.12.jar:git-Spigot-7228328-14b597f] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot-1.12.jar:git-Spigot-7228328-14b597f] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131]