Finish animation before playing another one

I'm struggling to make my character stay normal. I use ThirdPersonController with Animation component. My character has "idle", "walk", "run" and "jump" animations applied. For run animation I made him "roll", because his body is spherical but whenever I release Shift(in the middle of animation), he stays in that position (e.g. legs up) and goes into idle or walking animation depending on what I'm pressing.

I really need help with that, thanking everyone in advance!!!

EDITED result of an advice from the comments

ThirdPersonController.js

     // Pick speed modifier
     if (Input.GetKey (KeyCode.LeftShift) || Input.GetKey (KeyCode.RightShift))
     {
         targetSpeed *= runSpeed;
         _characterState = CharacterState.Running;
         // return new WaitForSeconds(walk.animation[newRoll].lenght);    
         //yield WaitForSeconds (animation["newRoll"].length);
     }
     else if (Time.time - trotAfterSeconds > walkTimeStart)
     {
         targetSpeed *= trotSpeed;
         _characterState = CharacterState.Trotting;
     }
     else
     {
     if(!animation.isplaying) { animation.crossfade("walk2"); }
         targetSpeed *= walkSpeed;
         _characterState = CharacterState.Walking;
     }