Need help with this code (Whitelist Kicker)

[DarkMaper]

I don't know if this goes here.

Good guys, I need help with this code I modified myself. The original code is this:

Code: Lua

1. local whitelist = { "SteamID1", "SteamID2" } -- add your steam id's here
2.  
3. function CheckWhiteList( ply )
4.         if not ULib.findInTable( whitelist, ply ) then
5.                 ULib.kick( ply )
6.         end
7. end
8. hook.Add( "PlayerInitialSpawn", "WhitelistCheck", CheckWhiteList )

I modified the code so that only leaked to those in certain group:

Code: Lua

1. function CheckWhiteList( ply )
2.         if
3.         not ply:CheckGroup("vip") or
4.         not ply:CheckGroup("guia") or
5.         not ply:IsAdmin()
6.         then
7.                 ULib.kick ( ply )
8.         end
9. end
10. hook.Add( "PlayerInitialSpawn", "WhitelistCheck", CheckWhiteList )

And my problem is... The code down the server when kick someone.
If you can help me with this. And sorry for my bad english.

P.D: My server show this error:

Code: [Select]

[ERROR] gamemodes/base/gamemode/player.lua:213: Tried to use a NULL entity!
1. SetTeam - [C]:-1
2. PlayerInitialSpawn - gamemodes/base/gamemode/player.lua:213
3 unkown - gamemodes/sandbox/gamemode/init.lua:121

I found a simpler way, and adding my groups to "ULX reservedslots". Close post pls.