Task #26 for PerWorldInventory v1.9.0 generated an exception

[clowrym]

The following exception seems to be happening quite often lately. I have 8 different worlds running on Multi-verse core, and am also running Multi-verse-Hether, Dynmap, Permissionsex, Holographic displays, Creative Gates and Warps 7.2 for plugins.

[16:04:27] [Server thread/WARN]: [PerWorldInventory] Task #26 for PerWorldInventory v1.9.0 generated an exception
java.lang.IllegalArgumentException: No enum constant org.bukkit.GameMode.0
at java.lang.Enum.valueOf(Enum.java:238) ~[?:1.8.0_111]
at org.bukkit.GameMode.valueOf(GameMode.java:1) ~[spigot-1.11.2.jar:git-Spigot-7d78b81-270755d]
at me.gnat008.perworldinventory.data.players.PWIPlayerManager.lambda$scheduleRepeatingTask$0(PWIPlayerManager.java:329) ~[?:?]
at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot-1.11.2.jar:git-Spigot-7d78b81-270755d]
at org.bukkit.craftbukkit.v1_11_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:353) [spigot-1.11.2.jar:git-Spigot-7d78b81-270755d]
at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:730) [spigot-1.11.2.jar:git-Spigot-7d78b81-270755d]
at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot-1.11.2.jar:git-Spigot-7d78b81-270755d]
at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:675) [spigot-1.11.2.jar:git-Spigot-7d78b81-270755d]
at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:574) [spigot-1.11.2.jar:git-Spigot-7d78b81-270755d]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_111]