ErrorException从空值创建默认对象-Laravel 5.4

Question

我的代码中有什么问题，我在服务器上遇到错误，而在本地服务器上工作正常。

数据也在数据库中传递。但得到错误

一个测验，问题有多种选择： 我遇到以下错误

(1/1) ErrorException
Creating default object from empty value 

public function update(Request $request, $id)
        {
          $this->validate($request, [
            'question'  => 'required|max:255',
            'score'  => 'required|integer',
          ]);

      $chapter_id = $request->chapter_id;
      $questions = Question::orderBy('id', 'asc')->paginate(25);
      $question = Question::findOrFail($id);

      $question -> question = $request -> question;
      $question -> explanation = $request -> explanation;
      $question -> score    = $request -> score;
      $question -> chapter_id = $chapter_id;
      $question -> sponsor_id = $request->sponsor_id;
      $question -> admin_id = Auth::guard('admin')->id();

        // Image Processing
      if($request->hasFile('image')){
        $image = $request->file('image');
        $filename = time() . '.' . $image->getClientOriginalExtension();

        $location = storage_path('/app/public/images/' . $filename);
        Image::make($image)->resize(800, 400)->save($location);
        $question -> question_image = $filename;
      }
        // Getting Next ID
      $question->save();
        // $option = New QuestionsOption;
        // $que = Question::all();

      for($a=1; $a<=5; $a++){
        $option = 'text_option_'. $a ;
        $option_id = 'option_id'. $a;
        $question_option = QuestionsOption::findOrFail($request ->$option_id);

问题在下面的行中。

        $question_option -> question_text = $request -> $option;
        $question_option -> correct    = $request->input('correct_' . $a);

        $question_option->save();
      }

      if($question->save()){

        return view('admin.questions.index', compact('questions', 'chapter_id'));
      } else{
        Session::flash('Sorry a problem occurred while adding Question');
        return redirect()->route('questions.create');
      }
    }