[00:55:34 ERROR]: Could not pass event InventoryClickEvent to Prefix v1.7.6
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[custom.jar:git-PaperSpigot-ba75d9a]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[custom.jar:git-PaperSpigot-ba75d9a]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [custom.jar:git-PaperSpigot-ba75d9a]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:1482) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.a(PacketPlayInWindowClick.java:15) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.handle(PacketPlayInWindowClick.java:65) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:189) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:795) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:307) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:643) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:549) [custom.jar:git-PaperSpigot-ba75d9a]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [custom.jar:git-PaperSpigot-ba75d9a]
Caused by: java.lang.IllegalArgumentException: Permission name cannot be null
        at org.bukkit.permissions.PermissibleBase.isPermissionSet(PermissibleBase.java:50) ~[custom.jar:git-PaperSpigot-ba75d9a]
        at ru.tehkode.permissions.bukkit.regexperms.PermissiblePEX.hasPermission(PermissiblePEX.java:135) ~[?:?]
        at org.bukkit.craftbukkit.v1_7_R4.entity.CraftHumanEntity.hasPermission(CraftHumanEntity.java:111) ~[custom.jar:git-PaperSpigot-ba75d9a]
        at de.langgezockt.Prefix.listener.PrefixListener.onInventoryClick(PrefixListener.java:59) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_77]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_77]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_77]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_77]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[custom.jar:git-PaperSpigot-ba75d9a]
        ... 13 more