Why would this while loop crash Unity?

I have the following code. It runs fine when I don't put it inside a while loop, but I need to as I need to try spawning another car if the one attempted is active already. I can't see anywhere that this would cause an infinite loop...

It's being called in OnTriggerEnter, not within update.

 function SpawnCar()
 {
     while (!bCarSpawned)
     {
         for (var i = 0; i < iRandom; ++i)
         {
             iIndex = Random.Range(0, AICarArray.Length); 
             iRandomDir = Random.Range(1, 3);
             
             //print(Vector3.Distance(transform.position, SpawnerArray[i].transform.position));
             
             if (!AICarArray[iIndex].active)
             {
                 AICarArray[iIndex].transform.position.x = SpawnerArray[i].transform.position.x; // Set car pos to spawner pos
                 AICarArray[iIndex].transform.position.y = SpawnerArray[i].transform.position.y + 1; 
                 AICarArray[iIndex].transform.position.z = SpawnerArray[i].transform.position.z; 
                 AICarArray[iIndex].transform.rotation = SpawnerArray[i].transform.rotation; 
                 
                 if (iRandomDir == 1)
                 {
                     AICarArray[iIndex].transform.tag = "AI_North";
                     AICarArray[iIndex].transform.localEulerAngles.y -= 180;
                     AICarArray[iIndex].transform.position.x += 2; // Put on right side of the road
                     //AICarArray[iIndex].rigidbody.velocity = transform.forward * -fInitialSpeedBoost; // Give initial boost
                 }
                 else
                 {
                     AICarArray[iIndex].transform.tag = "AI_South";
                     AICarArray[iIndex].transform.position.x += -2; // Put on left side of road
                     //AICarArray[iIndex].rigidbody.velocity = transform.forward * fInitialSpeedBoost; // Give initial boost
                 }
             
                 AICarArray[iIndex].SetActive(true);
                 bCarSpawned = true;
             }
         }
     }
 }