Error when taking over ownership for the first time.

Estecka

I have a scene with a non-prefab PhotonView, with ownership set as takeover.
The first time a connected player tries to take ownership over it, Photon will throw an error on every connected clients.

The error is the same for every clients :

NullReferenceException: Object reference not set to an instance of an object
Photon.Pun.PhotonNetwork.OnEvent (ExitGames.Client.Photon.EventData photonEvent) (at Assets/Photon/PhotonUnityNetworking/Code/PhotonNetworkPart.cs:2157)
Photon.Realtime.LoadBalancingClient.OnEvent (ExitGames.Client.Photon.EventData photonEvent) (at Assets/Photon/PhotonRealtime/Code/LoadBalancingClient.cs:2749)
ExitGames.Client.Photon.PeerBase.DeserializeMessageAndCallback (ExitGames.Client.Photon.StreamBuffer stream) (at C:/Dev/photon-sdk-dotnet/PhotonDotnet/PeerBase.cs:633)
ExitGames.Client.Photon.EnetPeer.DispatchIncomingCommands () (at C:/Dev/photon-sdk-dotnet/PhotonDotnet/EnetPeer.cs:550)
ExitGames.Client.Photon.PhotonPeer.DispatchIncomingCommands () (at C:/Dev/photon-sdk-dotnet/PhotonDotnet/PhotonPeer.cs:1473)
Photon.Pun.PhotonHandler.FixedUpdate () (at Assets/Photon/PhotonUnityNetworking/Code/PhotonHandler.cs:116)

The code I use to get this error are as simple as this :
Lobby scene :

using UnityEngine;

using Photon.Pun;
using Photon.Realtime;


public class Lobby : MonoBehaviourPunCallbacks {

	void Start(){
		PhotonNetwork.AutomaticallySyncScene = true;
		PhotonNetwork.ConnectUsingSettings();
	}

	public override void OnConnectedToMaster(){
		PhotonNetwork.JoinOrCreateRoom("room" , null, TypedLobby.Default);
	}

	public override void OnCreatedRoom(){
		PhotonNetwork.LoadLevel("Room");
	}
}

Room scene :

using UnityEngine;
using UnityEngine.EventSystems;

using Photon.Pun;

public class TakeOver : MonoBehaviour, IPointerClickHandler
{
    public PhotonView photon;

	void IPointerClickHandler.OnPointerClick(PointerEventData eventData){
		if (!photon.IsMine) {
			Debug.Log("Mine !");
			photon.TransferOwnership(PhotonNetwork.LocalPlayer);
		}
	}
}

Did I miss something important ?

Unity version : 2018.3.14f1
PUN version 2.10 Photon lib 4.1.2.12

Reproductions steps :
- Create a new Unity project, import PUN 2, then import this Unity Package : https://filebin.net/8xe9xfxb0v0atr1r
- In the build settings, add the scenes "Lobby" at 0 and "Room" at 1
- In the PhotonServer setting, set a fixed region. (Just to make sure two clients will always connect together.
- Make a standalone Debug build with Script debugging and run it. (Making it the master)
- Once the scene with The Cube has loaded in the build, run the "Lobby" scene in the editor.
- Once the scene with The Cube has loaded in the editor, click The Cube to assume ownership.
=> Both the Build and Editor will display an error.

JohnTube

Hi @Estecka,

Thank you for choosing Photon and for your excellent report!

This is indeed a bug in PUN 2.10 that will be fixed in the next update.

It was already reported by another customer here. A fix is already available in that post.