“Versuchen Sie, Eigenschaften "Header" auf String zu lesen” Code-Antworten

Versuchen Sie, Eigenschaften "Header" auf String zu lesen

Well in my case, the error happened in my middleware called 
AuthenticationMiddleware when i tried the example below:

I was giving a return of a response without using the Response method. 

Error : return "Welcome, " . $request->session()->get('user')->name

Solution: return Response("Welcome, " . $request->session()->get('user')->name);