Seems like brewers with a name only made with numbers crashes the site
For example, in Switzerland, those 3 brewers were crashing the site when clicking on their URL: 1386, 1936 and 8406.
example of crashing URL
https://www.ratebeer.com/brewers/8406/30149/
I managed to edit all of them using the old brewer edit page url
https://www.ratebeer.com/ratings/beer/showbrewer.asp?brewerid=
by adding their brewer number (ie 30149) to the url and after adding some letters to their name, it fixed their brewer page.
https://www.ratebeer.com/brewers/brauerei-8406/30149/