Number conversion error and NPE.
Created by: INTmAker
See the console log...
> [16:26:45 ERROR]: Could not pass event EntityDamageByEntityEvent to MMOItems v4.7.3 org.bukkit.event.EventException: null at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) [server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) [server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callEvent(CraftEventFactory.java:93) [server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:580) [server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:483) [server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.craftbukkit.v1_12_R1.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:612) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityLiving.damageEntity0(EntityLiving.java:1346) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityHuman.damageEntity0(EntityHuman.java:846) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityLiving.damageEntity(EntityLiving.java:868) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityHuman.damageEntity(EntityHuman.java:759) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityPlayer.damageEntity(EntityPlayer.java:586) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityArrow.a(EntityArrow.java:286) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityArrow.B_(EntityArrow.java:194) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.EntityTippedArrow.B_(EntityTippedArrow.java:86) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.World.entityJoinedWorld(World.java:1631) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.World.h(World.java:1601) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.World.tickEntities(World.java:1435) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.WorldServer.tickEntities(WorldServer.java:668) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:817) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [server.jar:git-Spigot-dcd1643-e60fc34] at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [server.jar:git-Spigot-dcd1643-e60fc34] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212] Caused by: java.lang.IllegalArgumentException: x not finite at org.bukkit.util.NumberConversions.checkFinite(NumberConversions.java:115) ~[server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.util.Vector.checkFinite(Vector.java:624) ~[server.jar:git-Spigot-dcd1643-e60fc34] at org.bukkit.craftbukkit.v1_12_R1.entity.CraftEntity.setVelocity(CraftEntity.java:242) ~[server.jar:git-Spigot-dcd1643-e60fc34] at net.Indyuce.mmoitems.listener.PlayerListener.a(PlayerListener.java:66) ~[MMOItems%20Legacy.jar:?] at sun.reflect.GeneratedMethodAccessor1246.invoke(Unknown Source) ~[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server.jar:git-Spigot-dcd1643-e60fc34] ... 24 more
It looks like you have a NPE at net.Indyuce.mmoitems.listener.PlayerListener.a class on line 66. You can add try() and catch() there.