15.11 13:59:06 [Server] INFO Zurisadai issued server command: /challenges
15.11 13:59:06 [Server] ERROR null
15.11 13:59:06 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'challenges' in plugin Challenges v1.6
15.11 13:59:06 [Server] INFO 	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:149) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at org.bukkit.craftbukkit.v1_13_R2.CraftServer.dispatchCommand(CraftServer.java:732) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.PlayerConnection.handleCommand(PlayerConnection.java:1766) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:1570) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:45) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.PacketPlayInChat.a(PacketPlayInChat.java:5) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.lambda$ensureMainThread$0(PlayerConnectionUtils.java:12) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_151]
15.11 13:59:06 [Server] INFO 	at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_151]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.SystemUtils.a(SystemUtils.java:109) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:1016) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:439) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:943) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:841) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]
15.11 13:59:06 [Server] INFO Caused by: java.lang.NullPointerException
15.11 13:59:06 [Server] INFO 	at me.bournedev.challenges.gui.ChallengesGUI.openChallengesGUI(ChallengesGUI.java:50) ~[?:?]
15.11 13:59:06 [Server] INFO 	at me.bournedev.challenges.gui.ChallengesGUI.<init>(ChallengesGUI.java:27) ~[?:?]
15.11 13:59:06 [Server] INFO 	at me.bournedev.challenges.Core.onCommand(Core.java:130) ~[?:?]
15.11 13:59:06 [Server] INFO 	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[custom.jar:git-Paper-446]
15.11 13:59:06 [Server] INFO 	... 15 more