org.bukkit.event.EventException: This exception has no message.

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java.lang.IllegalStateException: Can't retrieve player session from offline player!
at com.lenis0012.bukkit.loginsecurity.session.SessionManager.getPlayerSession(SessionManager.java:41)
at com.lenis0012.bukkit.loginsecurity.modules.general.PlayerListener.onEntityDamage(PlayerListener.java:266)
at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor81.execute(Unknown Source)
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502)
at org.bukkit.craftbukkit.v1_10_R1.event.CraftEventFactory.callEvent(CraftEventFactory.java:89)
at org.bukkit.craftbukkit.v1_10_R1.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:572)
at org.bukkit.craftbukkit.v1_10_R1.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:479)
at org.bukkit.craftbukkit.v1_10_R1.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:604)
at net.minecraft.server.v1_10_R1.EntityLiving.damageEntity0(EntityLiving.java:1258)
at net.minecraft.server.v1_10_R1.EntityHuman.damageEntity0(EntityHuman.java:867)
at net.minecraft.server.v1_10_R1.EntityLiving.damageEntity(EntityLiving.java:850)
at net.minecraft.server.v1_10_R1.EntityHuman.damageEntity(EntityHuman.java:792)
at net.minecraft.server.v1_10_R1.EntityPlayer.damageEntity(EntityPlayer.java:515)
at net.citizensnpcs.npc.entity.EntityHumanNPC.damageEntity(EntityHumanNPC.java:121)
at net.minecraft.server.v1_10_R1.EntityHuman.attack(EntityHuman.java:1029)
at net.minecraft.server.v1_10_R1.EntityPlayer.attack(EntityPlayer.java:1171)
at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1616)
at net.minecraft.server.v1_10_R1.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:48)
at net.minecraft.server.v1_10_R1.PacketPlayInUseEntity.a(PacketPlayInUseEntity.java:5)
at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)
at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:796)
at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:403)
at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:730)
at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:629)
at java.lang.Thread.run(Thread.java:745)

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