[Stinged]

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
    new name[MAX_PLAYER_NAME];
    new killer[MAX_PLAYER_NAME];
    new weapname[50];
    new string[50];
    GetPlayerName(playerid, name, sizeof(name));
    GetPlayerName(killerid, killer, sizeof(killer));
    GetWeaponName(GetPlayerWeapon(killerid), weapname, sizeof(weapname));
    
    if (killerid == INVALID_PLAYER_ID)
    {
        format(string, sizeof (string), "%s (%d) Died.", name, playerid);
        SendClientMessageToAll(0xAA3333AA, string);
    }
    else
    {   
        format(string,128,"%s(%d) Died. Killed by %s(%d) - %s.",name,playerid,killer,playerid,weapname);
        SendClientMessageToAll(0xAA3333AA, string);
        SetPlayerWantedLevel(killerid, GetPlayerWantedLevel(killerid) + 6);
        SetPlayerColor(killerid, 0xAA3333AA);
        PlayerPlaySound(playerid, 44070, 0, 0, 0);
        StopAudioStreamForPlayer(playerid);
    }
    SendDeathMessage(killerid, playerid, reason);
    return 1;
}

You need to check if killer id is invalid.