Blank modules page

[spanishcivilwarstamps]

I am using 1.6.1.20 and suddenly I can't access the Modules and Services page. It returns a white page. Nothing shown when debug is on.

PHP version 7.1.22

Memory limit 768 M

Max execution time 300

MySQL version 10.1.35-MariaDB-cll-lve

MySQL engine InnoDB

 

I've installed a backup and nothing changed. I've did a server rewind to yesterday when all was fine and also nothing changed.

Any idea about how to solve this, please?