Question Pausing and Restarting Mars Session

After reading a couple other threads about this I attempted to implement a few of the solutions with no favorable resolution. Currently we are trying to "Toggle Off" the Physical Camera on an iPhone when we are on a UI screen.

The 2 Posts I've Read on this topic: Turn Off Mars Camera and Reset MARS
We originally thought turning off the ARSessionOrigin components, or even the ARCamera would fix the problem however neither work.

I am pretty sure I'm close, but the issue I'm reaching currently is that I am using the following code from one of the forum posts:

Code (CSharp):

1. using System;
2. using Unity.MARS.Providers;
3. using Unity.MARS.Settings;
4. using Unity.XRTools.ModuleLoader;
5. using UnityEngine;
6.  
7. namespace Unity.MARS
8. {
9.     public class SessionUI : MonoBehaviour, IUsesFunctionalityInjection, IUsesSessionControl
10.     {
11.         IProvidesFunctionalityInjection IFunctionalitySubscriber<IProvidesFunctionalityInjection>.provider { get; set; }
12.         IProvidesSessionControl IFunctionalitySubscriber<IProvidesSessionControl>.provider { get; set; }
13.  
14.         void Awake()
15.         {
16.             // Only necessary if this script isn't already in the scene when you press Play
17.             this.EnsureFunctionalityInjected();
18.         }
19.  
20.         public void TogglePaused()
21.         {
22.             var marsCore = MARSCore.instance;
23.             var wasPaused = marsCore.paused;
24.             marsCore.paused = !wasPaused;
25.             if (wasPaused)
26.             {
27.                 this.ResumeSession();
28.             }
29.             else
30.             {
31.                 this.PauseSession();
32.             }
33.         }
34.     }
35. }

But I need to be able to Call this inside my GameManager.cs file when needed.

This is how I'm declaring it in the GameManager.cs file:

(This script is also "using Unity.MARS;")

Code (CSharp):

1.     public SessionUI session;

I'm implementing it like this:

Code (CSharp):

1. session.TogglePaused();

However, the issue I'm getting is that since this script "SessionUI" has that void Awake() function to not worry about linking it as the article stated. When I play my scene however and the editor hits line 194 (the first time session.TogglePaused(); is used and hits this error:

NullReferenceException: Object reference not set to an instance of an object

GameManager.Start () (at Assets/Scripts/GameManager.cs:194)

Any ideas to fix this?