suswinther

Obox Social Commerce was causing that error in my case.

I’m having the same issue and php throws an error saying:
PHP Warning: Declaration of OBOXFB_Upgrader::fs_connect($directories = Array) should be compatible with WP_Upgrader::fs_connect($directories = Array, $allow_relaxed_file_ownership = false) in wp-content/plugins/obox-social-commerce/admin/includes/update-class.php on line 4

Try to access your logs in /logs/php-error.log