Blank Page after entering comment

Hello,

Sorry i am new to coding and this is the first time i am learning to make my own website using wordpress. Your guestbook was very simple and nice to install. However everytime i post comment and hit submit it takes me to blank page. To be more specific : the website does get the comment but the user who entered it gets blank page after hitting submit.
Also i noticed that my website which is http://www.maypal.us after submitting comment it goes to http://www.maypal.us/# which is the blank page.

My problem might be very silly since i am totally new to all this but any help will be much appreciated.

Thank You.

https://wordpress.org/plugins/gwolle-gb/