maybe these posts help?

https://helpcenter.websitex5.com/fr/post/4525

https://helpcenter.websitex5.com/fr/post/157225

another question:  Is this also on a new project?

Hello Bent, 

thank you for having contacted us. When does the software crash? Do you get any error message? Could you send a screenshot, so to understand you situation better?

Thank you in advance. Kind regards.