Question Code runs fine in Editor, but fails in standalone

Code (CSharp):

1. NullReferenceException: Object reference not set to an instance of an object
2.   at Modules.Menues.MainMenuSceneSystem.Start () [0x00016] in <4adf5aef9b374086852bfda08310cdd4>:0
3.   at Modules.Core.Commons.SceneManagementSystem`1[TSceneType].OnCreate () [0x00006] in <4adf5aef9b374086852bfda08310cdd4>:0
4.   at Unity.Entities.ComponentSystemBase.CreateInstance (Unity.Entities.World world, Unity.Entities.SystemState* statePtr) [0x00029] in <02a8e9b73758432796e7d0f46dcda14c>:0
5.   at Unity.Entities.World.AddSystem_OnCreate_Internal (Unity.Entities.ComponentSystemBase system) [0x00020] in <02a8e9b73758432796e7d0f46dcda14c>:0
6.   at Unity.Entities.World.GetOrCreateSystemsAndLogException (System.Collections.Generic.IEnumerable`1[T] types, System.Int32 typesCount) [0x0006a] in <02a8e9b73758432796e7d0f46dcda14c>:0
7. UnityEngine.DebugLogHandler:Internal_LogException(Exception, Object)
8. UnityEngine.DebugLogHandler:LogException(Exception, Object)
9. UnityEngine.Logger:LogException(Exception, Object)
10. UnityEngine.Debug:LogException(Exception)
11. Unity.Debug:LogException(Exception)
12. Unity.Entities.World:GetOrCreateSystemsAndLogException(IEnumerable`1, Int32)
13. Unity.Entities.DefaultWorldInitialization:AddSystemToRootLevelSystemGroupsInternal(World, IEnumerable`1, Int32)
14. Unity.Entities.DefaultWorldInitialization:Initialize(String, Boolean)
15. Unity.Entities.AutomaticWorldBootstrap:Initialize()

if you are interested this is what is happening in MainMenuSceneSystem.Start()

Code (CSharp):

1.     protected override void Start()
2.     {
3.       EntityManager.CreateEntityWithComponent(GameSettings.Default());
4.  
5.       _mainCamera = Camera.main.transform;
6.     }

but i have some inheritance stuff going on, which means Start is getting called like this from the parent class:

Code (CSharp):

1. protected virtual void Start() { }
2.  
3.     protected sealed override void OnCreate()
4.     {
5.       RequireSingletonForUpdate<TSceneType>();
6.       Start();
7.     }

 

AutomaticWorldBootstrap uses

[RuntimeInitializeOnLoadMethod(BeforeSceneLoad)]

.

Is it possible that the scene is not yet loaded at the time you're accessing

Camera.main

?

 

That was it! Thanks. I moved everything into OnStartrunning and now it works