[Plugin: All-in-One Event Calendar] Special characters in slug result in error 404

In my site the All-in-One Calendar shows events from external iCal-feeds. Everything works fine, except for one thing: if the title of an event ends with special characters (e.g. stars), clicking on the Read more-button (‘Lees meer’) results in a 404 error. If I manually remove the stars from the end of the slug, everything works fine.

Example: view on July 25: GWOEMUL / THE HOST ★★★★. Click on it to expand and next click on the ‘Lees meer’-button. (The slug for this event is “../gwoemul-the-host-★★★★/..”)

My question: is there a fix for this problem? Is there a way to automatically remove special characters (or make them work!) from the slugs that contain them?

Thanks for your help!

https://www.ads-software.com/extend/plugins/all-in-one-event-calendar/