Bukkit

PLEASE FILL OUT ALL THE INFORMATION BELOW! IF YOU DON'T DON'T EXPECT IT TO GET FIXED!

What steps will reproduce the problem?
1. Have someone login into an account from another location while that account is logged in.

What is the expected output? What do you see instead?
Properly log off the account and relogin to it without errors. It seems the enderchest contents of that player was also lost.

Have you tried the latest version of MultiInv from http://build.yu8.me:8080/job/MultiInv3/ (If not please try it to see if it solves your issues)?
No

What version of the product are you using (if you say "latest" you will NOT be helped)?
v3.3.5

Do you have an error log of what happened?
[04:54:49] [Server thread/INFO]: Steve lost connection: You logged in from another location
[04:54:49] [Server thread/ERROR]: Could not pass event PlayerGameModeChangeEvent to MultiInv v3.3.5
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.setGameMode(CraftPlayer.java:758) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at de.luricos.bukkit.xAuth.PlayerDataHandler.restoreData(PlayerDataHandler.java:264) [xAuth.jar:?]
    at de.luricos.bukkit.xAuth.PlayerManager.unprotect(PlayerManager.java:397) [xAuth.jar:?]
    at de.luricos.bukkit.xAuth.listeners.xAuthPlayerListener.onPlayerQuit(xAuthPlayerListener.java:166) [xAuth.jar:?]
    at sun.reflect.GeneratedMethodAccessor869.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_65]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_65]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.PlayerList.disconnect(PlayerList.java:346) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:844) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.PlayerConnection.disconnect(PlayerConnection.java:182) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.aufdemrand.denizen.utilities.packets.intercept.AbstractListenerPlayIn.disconnect(AbstractListenerPlayIn.java:30) [denizen-0.9.7-SNAPSHOT.jar:?]
    at net.minecraft.server.v1_8_R3.PlayerList.attemptLogin(PlayerList.java:410) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.LoginListener.b(LoginListener.java:118) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.LoginListener.c(LoginListener.java:54) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.NetworkManager.a(NetworkManager.java:231) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.ServerConnection.c(ServerConnection.java:148) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:817) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
    at java.lang.Thread.run(Thread.java:745) [?:1.7.0_65]
Caused by: java.lang.NullPointerException
    at uk.co.tggl.pluckerpluck.multiinv.inventory.MIEnderchestInventory.<init>(MIEnderchestInventory.java:50) ~[?:?]
    at uk.co.tggl.pluckerpluck.multiinv.player.MIPlayer.saveEnderchestInventory(MIPlayer.java:153) ~[?:?]
    at uk.co.tggl.pluckerpluck.multiinv.listener.MIPlayerListener.onPlayerGameModeChange(MIPlayerListener.java:482) ~[?:?]
    at sun.reflect.GeneratedMethodAccessor624.invoke(Unknown Source) ~[?:?]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_65]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_65]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
    ... 28 more

What are your world folder names (with proper capitalization)?
world
world_nether
shops
flat
Isles
creativeworld

What is the contents of your config.yml and groups.yml?
useSQL: true
splitHealth: true
splitHunger: true
controlGamemode: true
separateGamemodeInventories: true
allowEnderChestPlacement: false
creativeGroups:
- creativeworld
sql:
  host: localhost
  port: '3306'
  username: 4498
  password: ae67fec96d
  database: 4498
  prefix: multiinv_
compatibilityMode: false
xpfix: true
SaveInventoryOnQuit: false

exampleGroup:
- world
- world_nether
- world_the_end
- shops
flatWorld:
- flat

What is the entire list of plugins on your server (doing /plugins on the console and pasting the output is a quick method to do this)?
Plugins (55): WorldBorder, TuxTwoLib, NetherRoofProtect, Buycraft, MassiveCore, Vault, PlotMe, Playtime, AutoMessage, Chairs, Register, AntiAd, OpenInv, ProtocolLib, Votifier, mcMMO, PlotMe-DefaultGenerator, nSpleef, GAListener, TimTheEnchanter, Citizens, LinksOnSigns, MultiInv, WorldEdit, CreativeGates, MotdManager, PermissionsEx, ScoreboardStats, LogBlock, Questioner, ChatCensor, LWC, WorldGuard, Orebfuscator3, BookRules, MobSpawnControl, DailyBonus, Herochat, BreedingLimit, Essentials, SkinsRestorer, Multiverse-Core, Denizen, xAuth, CompatNoCheatPlus, ChestShop, HolographicDisplays, NoCheatPlus, Towny, OtherDrops, EssentialsSpawn, VanishNoPacket, FriendlyHopper, Multiverse-Portals, MobArena

Please provide any additional information below.
Had a player say he lost his enderchest when someone tried to login as him, it seems the contents were not stolen but rather deleted according to the error above, even if the contents were stolen that error still happend.

Also got this error from a player who managed to transfer his inventory in one world to another survival world where they should have separate inventories.

[04:07:17] [Server thread/INFO]: Bob[/123.456.789] logged in with entity id 1158949 at ([world]883.1820307375035, 92.0, 1062.4994604941194)
[04:07:17] [Server thread/ERROR]: Could not pass event PlayerGameModeChangeEvent to MultiInv v3.3.5
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.setGameMode(CraftPlayer.java:758) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at de.luricos.bukkit.xAuth.PlayerManager.protect(PlayerManager.java:372) [xAuth.jar:?]
	at de.luricos.bukkit.xAuth.tasks.DelayedProtectTask.run(DelayedProtectTask.java:42) [xAuth.jar:?]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:726) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_65]
Caused by: java.lang.NullPointerException
	at uk.co.tggl.pluckerpluck.multiinv.inventory.MIItemStack.getItemMetaSerialized(MIItemStack.java:540) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.inventory.MIItemStack.<init>(MIItemStack.java:72) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.inventory.MIInventory.<init>(MIInventory.java:31) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.player.MIPlayer.saveInventory(MIPlayer.java:82) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.listener.MIPlayerListener.onPlayerGameModeChange(MIPlayerListener.java:485) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor624.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_65]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_65]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
	... 13 more
[04:07:17] [Server thread/ERROR]: Could not pass event PlayerGameModeChangeEvent to MultiInv v3.3.5
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.setGameMode(CraftPlayer.java:758) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at com.onarandombox.MultiverseCore.listeners.MVPlayerListener$2.run(MVPlayerListener.java:353) [Multiverse-Core-2.5%20(1).jar:?]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:726) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:367) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:657) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:560) [custom_server.jar:git-Spigot-f928e7a-e91aed8]
	at java.lang.Thread.run(Thread.java:745) [?:1.7.0_65]
Caused by: java.lang.NullPointerException
	at uk.co.tggl.pluckerpluck.multiinv.inventory.MIItemStack.getItemMetaSerialized(MIItemStack.java:540) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.inventory.MIItemStack.<init>(MIItemStack.java:72) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.inventory.MIInventory.<init>(MIInventory.java:31) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.player.MIPlayer.saveInventory(MIPlayer.java:82) ~[?:?]
	at uk.co.tggl.pluckerpluck.multiinv.listener.MIPlayerListener.onPlayerGameModeChange(MIPlayerListener.java:485) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor624.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_65]
	at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_65]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[custom_server.jar:git-Spigot-f928e7a-e91aed8]
	... 12 more

You realize if someone has your IP address they could log on and wipe out your database...Unless that is a fake user name and password.