Nav stoppingDistance causing trouble

Hello
I have a NavMeshAgent which has a stoppingDistance to player(the target).
The problem is that I want my NavMeshAgent move right after the bool gets true.
But the stoppingDistance causing trouble and my NavMeshAgent doesn't move!

Code (CSharp):

1.                 nav.destination = player.position + navDesTemp;
2.                 nav.speed = speedRun;
3.                 nav.stoppingDistance = stopDistForKill;
4.  
5. if( bool == true)
6. navDesTemp = transform.right * 10;