Bukkit

error with spigot 1.9.4.

08.06.2016 20:09:57 [WARN] java.lang.NullPointerException
08.06.2016 20:09:57 [WARN]     at io.hotmail.com.jacob_vejvoda.SuperWars.SuperWars.leaveGame(SuperWars.java:827)
08.06.2016 20:09:57 [WARN]     at io.hotmail.com.jacob_vejvoda.SuperWars.SuperWars.onCommand(SuperWars.java:2498)
08.06.2016 20:09:57 [WARN]     at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
08.06.2016 20:09:57 [WARN]     at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)
08.06.2016 20:09:57 [WARN]     at org.bukkit.craftbukkit.v1_9_R2.CraftServer.dispatchCommand(CraftServer.java:646)
08.06.2016 20:09:57 [WARN]     at org.bukkit.craftbukkit.v1_9_R2.entity.CraftPlayer.performCommand(CraftPlayer.java:243)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.taskmanager.tasks.PlayerActionTask.performCommand(PlayerActionTask.java:22)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.taskmanager.tasks.PlayerActionTask.runPlayerTask(PlayerActionTask.java:51)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.taskmanager.tasks.PlayerTask.runTask(PlayerTask.java:34)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.taskmanager.TaskManagerTaskExecutor.runTaskImpl(TaskManagerTaskExecutor.java:45)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.taskmanager.TaskManagerTaskExecutor.runTask(TaskManagerTaskExecutor.java:38)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.taskmanager.TaskManagerTaskExecutor.runTask(TaskManagerTaskExecutor.java:14)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.taskmanager.TaskManager.addTask(TaskManager.java:91)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.signs.ServerSignExecutor.executeSignFull(ServerSignExecutor.java:103)
08.06.2016 20:09:57 [WARN]     at de.czymm.serversigns.listeners.PlayerListener.playerInteractCheck(PlayerListener.java:60)
08.06.2016 20:09:57 [WARN]     at sun.reflect.GeneratedMethodAccessor320.invoke(Unknown Source)
08.06.2016 20:09:57 [WARN]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
08.06.2016 20:09:57 [WARN]     at java.lang.reflect.Method.invoke(Unknown Source)
08.06.2016 20:09:57 [WARN]     at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)
08.06.2016 20:09:57 [WARN]     at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
08.06.2016 20:09:57 [WARN]     at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
08.06.2016 20:09:57 [WARN]     at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
08.06.2016 20:09:57 [WARN]     at org.bukkit.craftbukkit.v1_9_R2.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:231)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.PlayerInteractManager.a(PlayerInteractManager.java:483)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.PlayerConnection.a(PlayerConnection.java:887)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.PacketPlayInUseItem.a(SourceFile:55)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.PacketPlayInUseItem.a(SourceFile:11)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.PlayerConnectionUtils$1.run(SourceFile:13)
08.06.2016 20:09:57 [WARN]     at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
08.06.2016 20:09:57 [WARN]     at java.util.concurrent.FutureTask.run(Unknown Source)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.SystemUtils.a(SourceFile:45)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.MinecraftServer.D(MinecraftServer.java:726)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.DedicatedServer.D(DedicatedServer.java:399)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.MinecraftServer.C(MinecraftServer.java:665)
08.06.2016 20:09:57 [WARN]     at net.minecraft.server.v1_9_R2.MinecraftServer.run(MinecraftServer.java:564)
08.06.2016 20:09:57 [WARN]     at java.lang.Thread.run(Unknown Source)