NetworkManager.Singleton = null on exe build

Multiplayer & Networking
1

Hy everybody
I’m making a multiplayer game with the standard NetworkManager. When I launch the game within unity Editor, everything works fine. However, when I build& Run I have this message:

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After debugging, turns out my “Network.singleton” null, which was not the case when I use the UnityEditor launcher. Any clues?
Thanks in advance.

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2

Update here: I found that the issue occured when I add the Network Idendity(Script).
I however don’t understand why :cry: