Debug a build

Hello, I have a project which is runing fine. However, when I add a custom cursor, the projects is ok in the editor preview. When I publish the app (mac os universal), the app remains blank (blue screen after the logo splash screen) and the app crashes. I do have to kill the process manually then.

I installed, then, an extension : "Log viewer" from the asset store but I can't even get a view on the logs when the app is started, because it remains blank after the splash screen.

Does anybody would have a solution to give me? I can't even check where the problem is... Thank you