[SiaReyes]

Quote:

// - Optimazed OnPlayerDeath.

Code:

public OnPlayerDeath(playerid, killerid, reason)
{
    PlayerInfo[playerid][pDeaths]++;

    if(GetPlayerMoney(playerid) < 500)
    {
      SendClientMessage(playerid, CRED, "[SERVER]: You didn't have $500 to fix your wounds, the server paid in your place!");
    }
    else if(GetPlayerMoney(playerid) > 500)
    {
      SendClientMessage(playerid, CRED, "[SERVER]: You got killed/self-death and paid $500 to fix your wounds.");
      GivePlayerMoney(playerid, -500);
      PlayerInfo[playerid][pCash] -= 500;
    }

    if(killerid != INVALID_PLAYER_ID)
    {
        PlayerInfo[killerid][pKills]++;
        new pname[MAX_PLAYER_NAME], ename[MAX_PLAYER_NAME], string[128];
        GetPlayerName(playerid, pname, sizeof(pname));
        GetPlayerName(killerid, ename, sizeof(ename));
        format(string, sizeof(string), "[SERVER]: You killed %s and looted $1,000 from him (+ 1 Score).", pname);
        SendClientMessage(killerid, CLIME, string);
        format(string, sizeof(string), "[SERVER]: You have been killed by %s!", ename);
        SendClientMessage(playerid, CRED, string);
        GivePlayerMoney(killerid, 1000);
        PlayerInfo[killerid][pCash] += 1000;
        SetPlayerScore(killerid, GetPlayerScore(killerid)+1);
    }

    SendDeathMessage(killerid, playerid, reason);

    return 1;
}

I think, it should be like, you didn't check if killerid is a valid player, it will throw runtime error.
You have declared pCash but didn't use it and also mySQL or SQLite Version will be good for a freeroam gamemode.