Unity2D: Frost effect Time.timescale = 0

I downloaded this package ("Frost Effect by Steven Craeynest") on Unity Asset Store and altered using DOTween to make the effect coming like an animation and only happens once I click on my frost button (button 1), I first disabled the frost button (button 1) in my inspector before playing the game, I created another button (button 2) to activate the frost button (button1). However I'm having issues with the frost effect. You see when I click on button 2 to activate the frost button (button 1) frost effect works the first time, but when my character dies and I click on button 2 again to use the frost effect button again, the frost effect work as it comes in but just when it's about to come out it stops everything (time.timescale = 0), until I press my pause button and the resume button then the frost effect animation comes out like normal. It doesn't only happens when I click to activate my frost button again, but it also happens when you play the game, then die and restart it, when you click on button 2 to activate the frost effect button it does the same thing as I mentioned above. Please if anyone can help that would be great. :)

This is video will show you what I am dealing with. Anyway this is my script:

 using UnityEngine;
 using System.Collections;
 using DG.Tweening;
 using UnityEngine.UI;

 public class FrostScriptButton : MonoBehaviour {

 private FrostEffect frost;
 float duration = 0.2f;
 float delayBeforeUnfreeze = 0.34f;
 private float previousTimeScale;
 public GameObject frostbutton;
 public int buttonCount = 0;
 int timesActivated =  0;

 public void Check() {
     buttonCount ++;
 }

 public void MinusFrostOrb() {
     PowerUpScript.FrostEffect = PowerUpScript.FrostEffect - 1; 
 }
 // Use this for initialization

 void Start () {    
     previousTimeScale = Time.timeScale;
 }

 public void Activate ()
 {
     frostbutton.SetActive (true);
 }

 public void CreateFrost ()
 {
     //if (frostActive) {
     //    yield break;
     //}
     //if (!isCoroutineStarted) {
         //isCoroutineStarted = true;
     if(timesActivated < buttonCount)
     {
         timesActivated++;

         GameObject.Find ("Main Camera").GetComponent<FrostEffect> ().enabled = true;
         DOTween.To (x => FrostEffect.FrostAmount = x, 0.0f, 0.34f, duration)
             .OnComplete (() => { 
                 //Unfreeze tween effect
                 DOTween.To (x => FrostEffect.FrostAmount = x, 0.34f, 0f, duration)
                     .SetDelay (delayBeforeUnfreeze);

                 //Set timescale back to previous.
                 Time.timeScale = previousTimeScale;
             })
             .SetUpdate(true);
     }
 }

}

Thank you. :)