When duplicating a quiz that has a question to another page of the same course in one of the answers choices, there is an error.

To reproduce :

• Log in as a teacher
• Go to a course homepage
• Go to the Announcements forum (or any other page of the course)
• Copy the URL
• Go back to the course homepage
• Turn editing on
• Add a Quiz
• Edit the quiz and Add a question (new Multiple choice question)
• Fill in some fields
• In one of the answers choices, add a link and paste the URL copied before (Announcements forum of the same course)
• Save the quiz
• Go back to the course home page
• In the Edit menu at the right side of the quiz, click Duplicate. You will see the error popup (error_question_answers_missing_in_db)