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(
at com.lenis0012.bukkit.loginsecurity.modules.general.PlayerListener.onFoodLevelChange(
at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
at java.lang.reflect.Method.invoke(
at org.bukkit.plugin.RegisteredListener.callEvent(
at org.bukkit.plugin.SimplePluginManager.fireEvent(
at org.bukkit.plugin.SimplePluginManager.callEvent(
at org.bukkit.craftbukkit.v1_10_R1.event.CraftEventFactory.callFoodLevelChangeEvent(
at net.minecraft.server.v1_10_R1.MobEffectList.tick(
at net.minecraft.server.v1_10_R1.MobEffect.b(SourceFile:111)
at net.minecraft.server.v1_10_R1.MobEffect.tick(SourceFile:98)
at net.minecraft.server.v1_10_R1.EntityLiving.tickPotionEffects(
at net.citizensnpcs.npc.entity.EntityHumanNPC.m(
at net.minecraft.server.v1_10_R1.World.entityJoinedWorld(
at net.minecraft.server.v1_10_R1.World.g(
at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(
at net.minecraft.server.v1_10_R1.MinecraftServer.D(
at net.minecraft.server.v1_10_R1.DedicatedServer.D(
at net.minecraft.server.v1_10_R1.MinecraftServer.C(

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