When I try to add a new style I get 500 Internal server error with dreaded "Premature End of Script Headers", i.e. Premature end of script headers: admin.php, referer: https://libertarianizm.net/admin.php?styles/import The server is Dreamhost VPS with plenty of RAM, four times exceeding current memory usage. The support checked the configuration and everything seems to work fine. Unfortunately, I'm unable to add the style. Any ideas what could be a reason?