[13:07:59 WARN]: [MBedwars] Task #151 for MBedwars v3.2.6-Beta1 generated an exception
java.lang.NullPointerException
	at java.lang.String.replace(String.java:2240) ~[?:1.8.0_151]
	at de.marcely.bedwars.game.arena.Arena$6.run(Arena.java:456) ~[?:?]
	at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-3fb9445-6e3cec8]
	at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:353) [spigot.jar:git-Spigot-3fb9445-6e3cec8]
	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:738) [spigot.jar:git-Spigot-3fb9445-6e3cec8]
	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot.jar:git-Spigot-3fb9445-6e3cec8]
	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot.jar:git-Spigot-3fb9445-6e3cec8]
	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot.jar:git-Spigot-3fb9445-6e3cec8]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_151]