[jlalt]

PHP код:

GetClosestVehicleForPlayer(playerid) 
{ 
    new vehicleid = INVALID_VEHICLE_ID; 
    new Float:distance = 5.0; 
    new Float:X, Float:Y, Float:Z; 
    GetPlayerPos(playerid, X, Y, Z); 
    for(new i = 0; i < MAX_VEHICLES; i++) 
    { 
        if(!IsValidVehicle(i)) continue; 
        new Float: tmp = GetVehicleDistanceFromPoint(i, X, Y, Z); 
        if(tmp > distance) continue; 
        vehicleid = i; 
        distance = tmp; 
    }
    if(vehicleid != INVALID_VEHICLE_ID) return vehicleid; 
    else return SendClientMessage(playerid,-1,"There are no vehicle near to you!");
} 


probably its because you giving player invalid vehicle id o.o try this code it would work