php - Blank page when accessing page in admin -

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i'm getting blank page when click on page link in administration in wordpress

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

it happens pages, other post types fine. have lots of pages, 2000.

here tried far without luck:

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

here of php settings:

  • wp memory limit: 256mb
  • php post max size: 8mb
  • php time limit: 300
  • php max input vars: 1920

when turn on wp_debug when click on pages:

notice: called constructor method wp_widget 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 allocate 80 bytes) in /var/www/vhosts/example.com/wp-includes/wp-db.php on line 2258

any appreciated.

seems memory issue. can please add following in wp-config.php 

define( 'wp_max_memory_limit' , '512m' );

let's know if tihs fixes memory issue? error saying 256m memory assigned not enough page load.


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