Cam texture stopped working in Unity 5/Android Lollipop

Hello guys. I'd like to start by saying that i updated almost simoultaneously to unity 5 and my Moto g 2013 to android 5.0.2 so I don't know the exact source of the issue.

Basically i'm remastering my android game to unity 5 and I'm getting some real issues that are getting me mad with a webcamtexture (i use it to scan some qr).

Before this upgrade it worked just fine: i have a script attached to a mesh renderer that shows me what the camera is pointing to like all the applications that uses camera and i could just use it to get all the informations i wanted. But now it suddenly stopped working and i have 0 clue about what the cause could be.

The mesh that used to show the camera results now is just a plain purple quad for the whole time and i keep getting errors like this in the logcat:

 I/Unity   (14652): NullReferenceException: Object reference not set to an instance of an object
 I/Unity   (14652):   at ScanTest.OnDestroy () [0x00000] in <filename unknown>:0     
 I/Unity   (14652):      
 I/Unity   (14652): (Filename:  Line: -1)    
 I/Unity   (14652): 

Love you logcat for being so clear and pointing me to immaginary negative lines of code

And this is the simple script i use (without the qr scanning stuff for making it cleaner but trust me I triple checked and (unfortunately) it doesn't work):

 using UnityEngine;
 using System.Collections;
 
 public class ScanTest : MonoBehaviour
 {
     private WebCamTexture camTexture;
 
     void Start ()
     {
         camTexture = new WebCamTexture();
         camTexture.requestedHeight = Screen.height; // 480;
         camTexture.requestedWidth = Screen.width; //640;
         camTexture.Play();
     }
 
     void Update () {
         camTexture.GetPixels32();
         GetComponent<MeshRenderer>().material.mainTexture = camTexture;
     }
 
     void OnDisable()
     {
         if (camTexture != null)
         {
             camTexture.Pause();
         }
     }
 
     void OnDestroy()
     {
         camTexture.Stop();
         print("the camTexture is not null");
     }
 }
 

After 4 hours of trying without result this makes me so angry! The game is out in the play store. If someone can help me he will get a special thanks in the release notes.

Many thanks and regards.