After having 'played' the dungeon once. Can edit the map still but no longer able to play it, it throws internal error.

[OwnAgePau]

I try to find out how this plugin is working, its buggin me though since I haven't been able to properly "end" the dungeon run yet even though I am using an [End] sign which doesn't seem to do much. The getting started guide doesn't really explain this either. But after I used /dxl play once and continue editting, save it, leave it and try to do /dxl play again it first tells me I have to leave a group (I never created a group, but it seemed to have auto-created one) I had to disband it in order to do /dxl play again. After which it threw the error you see below....

null
org.bukkit.command.CommandException: Unhandled exception executing command 'dxl' in plugin DungeonsXL v0.15.6
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:641) ~[gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1386) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1221) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_45-internal]
at java.util.concurrent.FutureTask.run(FutureTask.j
ava:266) [?:1.8.0_45-internal]
at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:748) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_45-internal]
Caused by: java.lang.NullPointerException
at io.github.dre2n.dungeonsxl.game.Game.‹init›(Game.java:98) ~[?:?]
at io.github.dre2n.dungeonsxl.command.PlayCommand.onExecute(PlayCommand.java:88) ~[?:?]
at io.github.dre2n.dungeonsxl.util.commons.command.BRCommandExecutor.onCommand(BRCommandExecutor.java:71) ~[?:?]
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[gbinvl_minecraft_spigot_1_12_1.jar:git-Spigot-edd0396-2a927e8]
... 15 more