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
I managed to edit all of them using the old brewer edit page url
by adding their brewer number (ie 30149) to the url and after adding some letters to their name, it fixed their brewer page.