Question Remote Settings Updated is returning null exception on Unity's Cloud diagnostics report

Managed Stack Trace:

AdNetworkManager.RemoteSettingsUpdated () (at <00000000000000000000000000000000>:0)
UnityEngine.RemoteSettings+UpdatedEventHandler.Invoke () (at <00000000000000000000000000000000>:0)

This is my code :

Code (CSharp):

1.  
2.  
3. public GameObject AdmobAdManager; //set using drag and drop inspector
4. public GameObject UnityManager; //set using drag and drop inspector
5.  
6. private void Awake()
7.     {
8.         RemoteSettings.Updated += RemoteSettingsUpdated;
9.         if (!Instance)
10.         {
11.             Instance = this;
12.             DontDestroyOnLoad(gameObject);
13.         }
14.         else
15.         {
16.             //Duplicate GameManager created every time the scene is loaded
17.             Destroy(gameObject);
18.             return;
19.         }
20.     }
21. private bool admobSelected = false;
22.  
23. private void RemoteSettingsUpdated()
24.     {
25.        
26.      
27.         if (RemoteSettings.HasKey(admobSelectedRemoteKey))
28.             admobSelected = RemoteSettings.GetBool(admobSelectedRemoteKey);
29.  
30.         if (admobSelected)
31.         {
32.             AdmobAdManager.SetActive(true);
33.             UnityManager.SetActive(false);
34.          
35.         }
36.         else
37.         {
38.             UnityManager.SetActive(true);
39.             AdmobAdManager.SetActive(false);
40.          
41.         }
42.     }