Fix #271

app/assets/javascripts/student_quizzes.js

@@ -67,7 +67,7 @@ var StudentQuizzes = {
     modalBody.empty()
 
     var instances = StudentQuizzes.allInstances().filter(function(qi) {
-        return (qi.quiz_number === quiz_number) && (qi.handed_in_time || qi.end_time)
+        return (qi.quiz_number === parseInt(quiz_number)) && (qi.handed_in_time || qi.end_time)
       })
 
     if (instances.length < 1) {