GriefPrevention 1.10.2-131 error UnloadWorldEvent

[12:02:48] [Server thread/ERROR] [Sponge]: Could not pass UnloadWorldEvent$Impl to Plugin{id=griefprevention, name=GriefPrevention, version=2.1.1, description=This plugin is designed to prevent all forms of grief., source=D:\For XX\setup\minecraft\Server\testing\Forge2107\mods\griefprevention-1.10.2-2.1.1.131.jar}
java.lang.NullPointerException
        at me.ryanhamshire.griefprevention.claim.ClaimWorldManager.unload(ClaimWorldManager.java:273) ~[ClaimWorldManager.class:?]
        at me.ryanhamshire.griefprevention.FlatFileDataStore.unloadWorldData(FlatFileDataStore.java:294) ~[FlatFileDataStore.class:?]
        at me.ryanhamshire.griefprevention.event.WorldEventHandler.onWorldUnload(WorldEventHandler.java:47) ~[WorldEventHandler.class:?]
        at org.spongepowered.common.event.listener.UnloadWorldEventListener_WorldEventHandler_onWorldUnload254.handle(Unknown Source) ~[?:?]
        at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95) ~[RegisteredListener.class:1.10.2-2107-6.0.0-BETA-1874]
        at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:357) [SpongeModEventManager.class:1.10.2-2107-6.0.0-BETA-1874]
        at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:340) [SpongeModEventManager.class:1.10.2-2107-6.0.0-BETA-1874]
        at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:385) [SpongeModEventManager.class:1.10.2-2107-6.0.0-BETA-1874]
        at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:370) [SpongeModEventManager.class:1.10.2-2107-6.0.0-BETA-1874]
        at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:140) [SpongeImpl.class:1.10.2-2107-6.0.0-BETA-1874]
        at org.spongepowered.common.world.WorldManager.unloadWorld(WorldManager.java:504) [WorldManager.class:1.10.2-2107-6.0.0-BETA-1874]
        at net.minecraftforge.common.DimensionManager.setWorld(DimensionManager.java:153) [DimensionManager.class:?]
        at net.minecraft.server.MinecraftServer.func_71260_j(MinecraftServer.java:407) [MinecraftServer.class:?]
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524) [MinecraftServer.class:?]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_101]