[Skylar Paul]

Managed to fix it with a ConnectedPlayers & IsPlayerConnected check.

pawn Code:

COMMAND:restart(playerid, params[])
{
    new File[50];
    printf("Saving %d players...", ConnectedPlayers);
    for(new i = 0; i < ConnectedPlayers; i++)
    {
        if(IsPlayerConnected(i))
        {
            format(File, sizeof(File), PFiles, pName(i));
            GetPlayerPos(i, PVar[i][pLastX], PVar[i][pLastY], PVar[i][pLastZ]);
            djSetInt        (File, "Kills",     PVar[i][pKills]);
            djSetInt        (File, "Deaths",    PVar[i][pDeaths]);
            djSetInt        (File, "Admin",     PVar[i][pAdmin]);
            djSetInt        (File, "Level",     PVar[i][pLevel]);
            djSetInt        (File, "Money",     PVar[i][pMoney]);
            djSetInt        (File, "Skin",     PVar[i][pSkin]);

            djSetFloat      (File, "LastX",     PVar[i][pLastX]);
            djSetFloat      (File, "LastY",     PVar[i][pLastY]);
            djSetFloat      (File, "LastZ",     PVar[i][pLastZ]);
            printf("%s has been saved.", pName(i));
        }
    }
    GameModeExit();
    return 1;
}