What is the output of php flarum info -vvv? It might throw an error too, can you share it?
Braden Flarum team is working hard to put everything stable soon
I'm sorry, what is not stable? Did I miss a very bad release? Flarum has been stable since May last year and stable to us never meant that things break while using it, only that things might break while upgrading. If there's anything wrong with a flarum installation it's usually either a server issue or a community extension issue.
