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FAQ > Error when student didn’t click the Exit Exam button

Solution will be included in next update, for now, you can solve the bug by follow the steps below:

Bug description: Null exception error occurred when student didn’t click the Exit Exam button.

1. Open ResultController in Visual Studio

2. Go to GetResultViewModel method, replace the code with the following:

   [Authorize(Roles = "System Admin, Teacher, Student")]
   public ResultViewModel GetResultViewModel(string eId, string sId, StudentExam studentExam, int? totalQuestion = 0)
   {
       ResultViewModel model = new ResultViewModel();
       model.ExamId = eId;
       model.StudentId = sId;
       var exam = db.Exams.Where(a => a.Id == eId).Select(a => new { MarkToPass = a.MarksToPass, ExamName = a.Name, ReleaseAnswer = a.ReleaseAnswer, StartDate = a.StartDate, Duration = a.Duration }).FirstOrDefault();
       decimal? scoreToPass = exam?.MarkToPass;
       model.ExamName = exam?.ExamName;
       model.ReleaseAnswer = exam?.ReleaseAnswer ?? false;
       model.TotalQuestions = (totalQuestion == null || totalQuestion == 0) ? db.ExamQuestions.Where(a => a.ExamId == eId).Count() : totalQuestion;
       model.StudentName = db.UserProfiles.Where(a => a.AspNetUserId == sId).Select(a => a.FullName).FirstOrDefault();
       model.TotalScore = (from t1 in db.ExamQuestions
                           where t1.ExamId == eId
                           select t1.Mark).Sum();
       model.AnsweredCorrect = db.StudentAnswerCloneds.Where(a => a.StudentId == sId && a.ExamId == eId && a.MarksObtained > 0).Count();
       model.ScoreToPass = scoreToPass;
       if (studentExam == null)
       {
           studentExam = new StudentExam();
       }
       model.YourScore = studentExam.Result ?? db.StudentAnswerCloneds.Where(a => a.StudentId == sId && a.ExamId == eId && a.MarksObtained > 0).Select(a => a.MarksObtained).Sum();
       model.Passed = studentExam.Passed ?? (model.YourScore >= model.ScoreToPass) ? true : false;
       model.StartDateTime = studentExam.IsoUtcStartedOn ?? "";
       model.EndDateTime = studentExam.IsoUtcEndedOn ?? "";
       studentExam.StartedOn = (studentExam.StartedOn == null) ? exam.StartDate : studentExam.StartedOn;
       if (studentExam.EndedOn != null && studentExam.StartedOn != null)
       {
           model.TimeTaken = Math.Round((studentExam.EndedOn - studentExam.StartedOn).Value.TotalMinutes, 2).ToString();
       }
       else
       {
           model.TimeTaken = exam.Duration.ToString();
       }
       return model;
   }