[Threshold]

pawn Код:

COMMAND:list(playerid, params[])
{
    new string_total[256];
    for(new i = 1; i <= MAX_VEHICLES; i++)
    {
        printf("i = %i | proprio: %s | name: %s", i, VehInfo[(i - 1)][Proprio], NameRequete[playerid]);
        if(!strcmp(VehInfo[(i - 1)][Proprio], NameRequete[playerid], true) && strlen(VehInfo[(i - 1)][Proprio]))
        {
            printf("on a trouver ton veh: i = %i", i);
            if(!IsABike(i))
            {
                printf("et c pas un bike!");
                new stringveh[25];
                format(stringveh, sizeof(stringveh), "%s\n", GetVehicleName(i));
                strins(string_total, stringveh, strlen(string_total));
                printf("fin!");
            }
        }
    }
    return ShowPlayerDialog(playerid, 11, DIALOG_STYLE_LIST, "Veh:", string_total, "Valider", "Annuler");
}

You need to subtract 1 from vehicle IDs, because elements start at '0', however vehicle IDs start at '1'. If you don't, you will get an out of bounds error.