wordtodictionary

The Issue I am facing due to Glossary plugin is “This page isn’t working https://www.wordtodictionary.com is currently unable to handle this request.
HTTP ERROR 500”
No, When I activate plugin I cannot access the WordPress backend.
PHP Version 5.6.36
WordPress Version 4.9.8

I am Using Glossary by Codeat since I created my website https://www.wordtodictionary.com
I have also published more than 700 Posts in Glossary.
But Yesterday Suddenly my website shows “500 ERROR This site can’t be reached. When I get Support to my hosting provider they tell me that “This Error is due to the Glossary by codeat Installed Plugin. And, When I deactivated glossary from cpanel, My website starts working. But, I have lost all my glossary posts. And, When I again activate glossary plugin then my whole website again shows 500 Error.
I have purchased and install premium version.
Help me to recover this.

Same Problem Exists when I purchase and Install Glossary By Codeat premium version.