Blank page when accessing page in admin

I’m getting a blank page when I click on the page link in the administration in WordPress

/wp-admin/edit.php?post_type=page

It only happens with pages, all the other post types are fine. I have lots of pages, nearly 2000.

Here is what i tried so far without luck:

  • switching to default theme
  • deactivating all plugins
  • deactivating revisions in wp-config

Here is some of my php settings:

  • WP Memory Limit: 256MB
  • PHP Post Max Size: 8MB
  • PHP Time Limit: 300
  • PHP Max Input Vars: 1920

When I turn on WP_debug I get this when I click on pages:

Notice: The called constructor method for WP_Widget is deprecated since  version 4.3.0! Use

__construct()

in /var/www/vhosts/example.com/wp-includes/functions.php on line 3457

Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 80 bytes) in /var/www/vhosts/example.com/wp-includes/wp-db.php on line 2258

Any help is appreciated.


Source: wordpress

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