Why does this coroutine freeze my game?

Questions & Answers
1

I’m using a coroutine to manage NPC spawns, and it seems to my eyeballs that it runs and yields correctly, but every time I run the game it freezes up after a few seconds, and disabling this coroutine results in it no longer freezing. Do I have an obvious mistake in my implementation?

void Awake(){
		StartCoroutine (managePedestrianPopulation());
	}

	IEnumerator managePedestrianPopulation(){
		while (true) {
			SpawnPedestrian(); //Check actual population density vs. desired population density, spawn new ones if under, remove old ones if way over
			yield return new WaitForSeconds(2f);
		}
	}


	void SpawnPedestrian(){

		if (activeSpawners.Count > 0){ 												//If there are any active spawners in the game
			int randomIndex = Random.Range (0, activeSpawners.Count);				//Select a random spawner from the list of active ones
			Transform newPedestrian = PoolManager.Pools ["Pedestrians"].Spawn (		//Pooling system: grab a pedestrian prefab from my pool and spawn it at the spawner selected above
				pedestrianPrefab,
				activeSpawners[randomIndex].t.position,
				Quaternion.identity
			);
	    }
     }
2

It’s the while loop. Change it to if (or if and else). Happened to me all the time until I realized that you can only use while loops in very specific situations.

i.e. → 

 if (true) {
             SpawnPedestrian(); //Check actual population density vs. desired population density, spawn new ones if under, remove old ones if way over
             yield return new WaitForSeconds(2f);
         }