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java.lang.NullPointerException: 	at com.comze_instancelabs.minigamesapi.ArenaListener.onSignUse(ArenaListener.java:1705)	at sun.reflect.GeneratedMethodAccessor55.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:232)	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:199)	at org.bukkit.craftbukkit.v1_11_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:195)	at net.minecraft.server.v1_11_R1.PlayerConnection.a(PlayerConnection.java:942)	at net.minecraft.server.v1_11_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:26)	at net.minecraft.server.v1_11_R1.PacketPlayInBlockPlace.a(PacketPlayInBlockPlace.java:1)	at net.minecraft.server.v1_11_R1.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)	at java.util.concurrent.FutureTask.run(Unknown Source)	at net.minecraft.server.v1_11_R1.SystemUtils.a(SourceFile:46)	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:739)	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399)	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:675)	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:574)	at java.lang.Thread.run(Unknown Source)