[Michael@Belgium]

I hope you have

pawn Код:

KillTimer(AcMessageTimer[playerid]);

under OnPlayerDisconnect

EDIT: and it would be better if you would do:

pawn Код:

public AntiCheat(playerid)
{
        if(!AllowedWeapon[playerid][GetPlayerWeapon(playerid)] && IsValidWeapon(weap2) && GetPlayerWeapon(playerid) != 46 && (GetPlayerState(playerid) == PLAYER_STATE_ONFOOT && Info[playerid][AdminLevel] == 0))
        {
                new weap2=GetPlayerWeapon(playerid);
                new WeaponName2[65];
                GetWeaponName(weap2,WeaponName2,64);
                format(AcMsg,sizeof(AcMsg),"ACMsg: System has detected possible weapon hack of %s at %s(%d).",WeaponName2,PlayerName(playerid),playerid);
                SendClientMessageToAdmin(1,-1,RED,AcMsg);
                format(AcMsg,sizeof(AcMsg), "8,1%s",AcMsg);
                IRC_GroupSay(gGroupID, IRC_ADMIN_CHANNEL,AcMsg);
                IRC_GroupSay(gGroupID, IRC_MANAGEMENT_CHANNEL,AcMsg);
        }
        return 1;
}