I'm building my website with muffin builder but I can't update my work. When I click the "update" button the page crashes
Please share with us your PHPINFO file. It's really necessary right now.
If you do not know how to do it, please check this topic:
Please, turn off all of the plugins, refresh your cache, and check if the problem persists.
Moreover, if you use a child theme, switch to parent, and recheck it.
You have a low max input time value set on your server.
Please, contact your hosting provider, and ask to increase it to at least 180s.
If this will not help, please, let me know.