[17:29:38 INFO]: [WorldGuard] Region data changes made in 'skyworld' have been background saved
[17:29:38 ERROR]: Could not pass event PlayerInteractEvent to uSkyBlock v2.7.1
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot.jar:git-Spigot-7745d45-02d704b]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-7745d45-02d704b]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-7745d45-02d704b]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-7745d45-02d704b]
        at org.bukkit.craftbukkit.v1_10_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:231) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.PlayerInteractManager.a(PlayerInteractManager.java:492) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:890) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.PacketPlayInUseItem.a(SourceFile:55) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.PacketPlayInUseItem.a(SourceFile:11) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-7745d45-02d704b]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_91]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_91]
        at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:737) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:399) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:673) [spigot.jar:git-Spigot-7745d45-02d704b]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:572) [spigot.jar:git-Spigot-7745d45-02d704b]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_91]
Caused by: java.lang.IllegalArgumentException: UUID cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[spigot.jar:git-Spigot-7745d45-02d704b]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.getOfflinePlayer(CraftServer.java:1329) ~[spigot.jar:git-Spigot-7745d45-02d704b]
        at org.bukkit.Bukkit.getOfflinePlayer(Bukkit.java:763) ~[spigot.jar:git-Spigot-7745d45-02d704b]
        at us.talabrek.ultimateskyblock.uuid.FilePlayerDB.getName(FilePlayerDB.java:111) ~[?:?]
        at us.talabrek.ultimateskyblock.island.IslandInfo.getTrustees(IslandInfo.java:520) ~[?:?]
        at us.talabrek.ultimateskyblock.uSkyBlock.playerIsTrusted(uSkyBlock.java:710) ~[?:?]
        at us.talabrek.ultimateskyblock.uSkyBlock.playerIsOnIsland(uSkyBlock.java:697) ~[?:?]
        at us.talabrek.ultimateskyblock.event.PlayerEvents.onClickOnObsidian(PlayerEvents.java:93) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor197.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_91]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_91]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot.jar:git-Spigot-7745d45-02d704b]
        ... 17 more