[00:37:32] [pool-18-thread-1/ERROR]: [PermissionsEx] Error occurred with PermissionsEx! Please post it to http://git.io/A5KwTg. Full error:
java.lang.IllegalArgumentException: Permissions being checked must not be null!
	at org.apache.commons.lang.Validate.notNull(Validate.java:192)
	at ru.tehkode.permissions.bukkit.regexperms.PermissiblePEX.permissionValue(PermissiblePEX.java:227)
	at ru.tehkode.permissions.bukkit.regexperms.PermissiblePEX.hasPermission(PermissiblePEX.java:127)
	at org.bukkit.craftbukkit.v1_7_R4.entity.CraftHumanEntity.hasPermission(CraftHumanEntity.java:111)
	at io.hotmail.com.jacob_vejvoda.slot_lock.slot_lock.checkLocked(slot_lock.java:402)
	at io.hotmail.com.jacob_vejvoda.slot_lock.slot_lock.onPlayerInteract(slot_lock.java:205)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494)
	at org.bukkit.craftbukkit.v1_7_R4.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:242)
	at net.minecraft.server.v1_7_R4.PlayerInteractManager.dig(PlayerInteractManager.java:103)
	at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:552)
	at net.minecraft.server.v1_7_R4.PacketPlayInBlockDig.a(PacketPlayInBlockDig.java:41)
	at net.minecraft.server.v1_7_R4.PacketPlayInBlockDig.handle(PacketPlayInBlockDig.java:65)
	at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186)
	at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81)
	at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734)
	at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289)
	at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584)
	at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490)
	at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628)