[Konstantinos]

Something like this will do I suppose:

pawn Код:

new targetid, text[128];
    
if (sscanf(params, "us[128]", targetid, text))
    return SendClientMessage(playerid, COLOR_GREY, "USAGE: /whisper [playerid/name/maskid] [text]");
        
if (targetid == INVALID_PLAYER_ID)
{
    if ((!sscanf(params, "is[128]", targetid, text) && targetid > MAX_PLAYERS && GetMaskPlayerID(targetid) == INVALID_PLAYER_ID)
        || targetid < MAX_PLAYERS)
        return SendClientMessage(playerid, COLOR_LIGHTRED, "You have specified an invalid player.");
}