[21:19:18 ERROR]: Could not pass event PlayerInteractEvent to xNoHacks v1.7.9
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:299) ~[spigot.jar:git-Spigot-1543]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-1543]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot.jar:git-Spigot-1543]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot.jar:git-Spigot-1543]
        at org.bukkit.craftbukkit.v1_7_R3.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:243) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.PlayerInteractManager.dig(PlayerInteractManager.java:103) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:549) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.PacketPlayInBlockDig.a(SourceFile:53) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.PacketPlayInBlockDig.handle(SourceFile:8) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:184) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:731) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:284) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1543]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1543]
Caused by: java.lang.IllegalArgumentException: Plugin cannot be null
        at org.apache.commons.lang.Validate.notNull(Validate.java:192) ~[spigot.jar:git-Spigot-1543]
        at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.validate(CraftScheduler.java:393) ~[spigot.jar:git-Spigot-1543]
        at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.runTaskTimer(CraftScheduler.java:120) ~[spigot.jar:git-Spigot-1543]
        at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.scheduleSyncRepeatingTask(CraftScheduler.java:116) ~[spigot.jar:git-Spigot-1543]
        at org.bukkit.craftbukkit.v1_7_R3.scheduler.CraftScheduler.scheduleSyncDelayedTask(CraftScheduler.java:100) ~[spigot.jar:git-Spigot-1543]
        at mcaction.xnohacks.checks.TimerModifications.onInteract(TimerModifications.java:39) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_55]
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_55]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_55]
        at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_55]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:296) ~[spigot.jar:git-Spigot-1543]
        ... 15 more