Donec

The error you're seeing—Uncaught PHP Exception Twig\Error\RuntimeError: "Impossible to access an attribute ("email") on a null variable."—is clearly related to the fact that app.user is null when you try to access app.user.email in your template. This is a continuation of the issue we discussed earlier. To fix it, you need to ensure that the app.user variable is only accessed when it's not null. Since the error points specifically to line 76 of your index.html.twig file, you should focus on ensuring that the app.user checks are correctly in place at that point.