fix hidden message bug
fix hidden message bug

alexcu/doubtfire-web,final-year-project/doubtfire-web,doubtfire-lms/doubtfire-web,doubtfire-lms/doubtfire-web,alexcu/doubtfire-web,doubtfire-lms/doubtfire-web,final-year-project/doubtfire-web,doubtfire-lms/doubtfire-web