[19:59:15 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing 'rename &7Coolheid' in me.nl.YourPalJake.TitanEssentials.ItemRename.RenameCMD(rename)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:148) ~[spigot.jar:git-Spigot-7228328-d603539]
        at org.bukkit.craftbukkit.v1_12_R1.CraftServer.dispatchCommand(CraftServer.java:644) ~[spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.PlayerConnection.handleCommand(PlayerConnection.java:1385) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.PlayerConnection.a(PlayerConnection.java:1220) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:45) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.PacketPlayInChat.a(PacketPlayInChat.java:1) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.PlayerConnectionUtils$1.run(SourceFile:13) [spigot.jar:git-Spigot-7228328-d603539]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_151]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_151]
        at net.minecraft.server.v1_12_R1.SystemUtils.a(SourceFile:46) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:747) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:405) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:678) [spigot.jar:git-Spigot-7228328-d603539]
        at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:576) [spigot.jar:git-Spigot-7228328-d603539]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_151]
Caused by: java.lang.IllegalArgumentException: Permission name cannot be null
        at org.bukkit.permissions.PermissibleBase.hasPermission(PermissibleBase.java:66) ~[spigot.jar:git-Spigot-7228328-d603539]
        at org.bukkit.craftbukkit.v1_12_R1.entity.CraftHumanEntity.hasPermission(CraftHumanEntity.java:112) ~[spigot.jar:git-Spigot-7228328-d603539]
        at me.nl.YourPalJake.TitanEssentials.ItemRename.RenameCMD.execute(RenameCMD.java:41) ~[?:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[spigot.jar:git-Spigot-7228328-d603539]
        ... 14 more