[Man43]

I just getting an error for trying to check if player got banned's or not.. when connected but always I got this error

PHP код:

    if(!isnull(params)) BannedFromServer[params] = true; 


Error is: error 033: array must be indexed (variable "params")

FULL COMMAND:

PHP код:

CMD:ban(playerid, params[])
{
    if(PlayerInfo[playerid][pAdmin] < 2)
        return SendClientMessage(playerid, COLOR_GREY, "{FF0000}Error: {FFFFFF}Wrong command!! {FF0000}Check availables commands from here `{FFFFFF}/cmds{FF0000}`.");
    new
        pName[MAX_PLAYER_NAME],
        tName[MAX_PLAYER_NAME],
        targetid,
        string[128],
        reason[80]
    ;
    if(!aDuty[playerid])
        return SendClientMessage(playerid, COLOR_GREY, "{FF0000}Error: {FFFFFF}You must be ADMIN ON DUTY to kick someone.");
    if(sscanf(params, "us[80]", targetid, reason))
        return SendClientMessage(playerid, COLOR_WHITE, "USAGE: /ban [playerid] [reason]");
    if(!IsPlayerConnected(targetid))
        return SendClientMessage(playerid, COLOR_GREY, "{FF0000}Error: {FFFFFF}INVAILD PLAYER ID / NAME.");
    if(PlayerInfo[playerid][pAdmin] < PlayerInfo[targetid][pAdmin])
        return SendClientMessage(playerid, COLOR_GREY, "{FF0000}Error: {FFFFFF}Player has a higher admin level than you. [CAN'T BANNED]!");
    if(!isnull(params)) BannedFromServer[params] = true;
    GetPlayerName(playerid,pName,sizeof(pName));
    GetPlayerName(targetid,tName,sizeof(tName));
    format(string, sizeof(string), "{FB00FF}[BANNED]: PLAYER %s(%d) has been BANNED by Admin %s(%d), REASON: %s.", tName,targetid, pName,playerid, reason);
    SendClientMessageToAll(-1, string);
    GameTextForPlayer(targetid, "~P~BANNED", 10000, 3);
    SetTimerEx("Banned",5200,false,"i",targetid);
    return 1;
}