Coroutine not stopping

Hi I will give you the code first.

     public Transform sight;
     public GameObject Player;
     NavMeshAgent navMeshAgent;
     NavMeshPath path;
     public float timeForNewPath;
     bool inCoRoutine;
     Vector3 target;
     bool validPath;
     bool wandering;
     public Animator anim;
 
 
 
 
     void Start()
     {
         navMeshAgent = GetComponent<NavMeshAgent> ();
         path = new NavMeshPath ();
         navMeshAgent.speed = speedController.speedValue;
         wandering = true;
     }        
         
 
     void Update()
     {
         if (!inCoRoutine && wandering)
             StartCoroutine (DoSomething ());
         if (navMeshAgent.velocity.magnitude > 1.0f) 
         {
             anim.SetBool ("IsWalking", true);
         } 
         else
         {
             anim.SetBool ("IsWalking", false);
         }
     }
 
     Vector3 getNewRandomPosition()
     {
         float x = Random.Range (-45, -5);
         float y = Random.Range (0, 0.2f);
         float z = Random.Range (-33, 25);
 
         Vector3 pos = new Vector3 (x, 0, z);
         return pos;
     }
 
     IEnumerator DoSomething()
     {
         inCoRoutine = true;
         yield return new WaitForSeconds (timeForNewPath);
         GetNewPath ();
         validPath = navMeshAgent.CalculatePath (target,path);
 
 
         while (!validPath) 
         {
             yield return new WaitForSeconds (0.01f);
             GetNewPath ();
             validPath = navMeshAgent.CalculatePath (target,path);
         }
         inCoRoutine = false;
 
     }
 
     void GetNewPath()
     {
         target = getNewRandomPosition ();
         navMeshAgent.SetDestination (target);
     }
 
     void OnTriggerStay()
     {
         inCoRoutine = false;
         StopCoroutine (DoSomething ());
         navMeshAgent.SetDestination (Player.transform.position);
         wandering = false;
     }
 
     void OnTriggerExit()
     {
 
         StartCoroutine (DoSomething ());
         wandering = true;
     }
 
             
 }

I made a trigger that will stop the Coroutine, but it keeps going on...
I used bool but it doesn't seems to work.
Help me!