Title: Error 500 on editing posts
Last modified: September 10, 2026

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# Error 500 on editing posts

 *  [nicollb](https://wordpress.org/support/users/nicollb/)
 * (@nicollb)
 * [1 day, 8 hours ago](https://wordpress.org/support/topic/error-500-on-editing-posts/)
 * We have been frequently unable to edit posts on a site with this plugin activated.
   If I deactivate, the app then we are back in business.
 * Setup: WordPress (multisite) – WP version 7.1
   Theme: Divi5Subsite installs of
   WPMobile to show the app in various languages (We use MLP for multiple language
   sites).This seems to have come about since the latest update in August.
 * My debug log shows this:
 * [10-Sep-2026 16:13:29 UTC] PHP Warning: Undefined array key “uk” in /usr/www/
   users/xxx/famvin-org/wp-content/plugins/wpappninja/inc/admin/ui/options.php on
   line 943
   [10-Sep-2026 16:13:29 UTC] PHP Warning: Attempt to read property “name”
   on null in /usr/www/users/nxxx/famvin-org/wp-content/plugins/wpappninja/inc/admin/
   ui/options.php on line 3399[10-Sep-2026 16:13:29 UTC] PHP Deprecated: trim():
   Passing null to parameter #1 ($string) of type string is deprecated in /usr/www/
   users/xxx/famvin-org/wp-content/plugins/wpappninja/inc/admin/ui/options.php on
   line 3399[10-Sep-2026 16:15:15 UTC] Cron reschedule event error for hook: wpappninjacron,
   Error code: invalid_schedule, Error message: Event schedule does not exist., 
   Data: {“schedule”:”wpappninja_every_three_minutes”,”args”:[],”interval”:60}
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-500-on-editing-posts%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Thread Starter [nicollb](https://wordpress.org/support/users/nicollb/)
 * (@nicollb)
 * [1 day, 8 hours ago](https://wordpress.org/support/topic/error-500-on-editing-posts/#post-19016847)
 * This seems to be related to one subsite (famvin.org/en) and maybe famvin.org/
   es.
 * Other subsites with far fewer posts in the database seem quite ok.
 *  Plugin Author [Amauri](https://wordpress.org/support/users/amauric/)
 * (@amauric)
 * [1 day, 8 hours ago](https://wordpress.org/support/topic/error-500-on-editing-posts/#post-19016852)
 * Hi
 * The pasted error logs didnt show the explanation of the 500.
   Search for “Fatal
   Error”.If the issue happen on websites with a lot of posts, I’m not sure it’s
   related to wpmobile.
 *  Thread Starter [nicollb](https://wordpress.org/support/users/nicollb/)
 * (@nicollb)
 * [1 day, 5 hours ago](https://wordpress.org/support/topic/error-500-on-editing-posts/#post-19016959)
 * We have WPMobile deactivated and editing seems to be working. It does seem to
   affect sites with lots of posts (10K+); When I turn it back on I will turn off
   the automatic push option. But my editors need to publish some things after several
   days of errors.
   I think it is related, but I’m not sure how.
 *  Plugin Author [Amauri](https://wordpress.org/support/users/amauric/)
 * (@amauric)
 * [17 hours, 41 minutes ago](https://wordpress.org/support/topic/error-500-on-editing-posts/#post-19017313)
 * Check your server error log to find the explanation of the 500 error.
 * With the log I’ll be able to tell you if it’s related to WPMobile or not.

Viewing 4 replies - 1 through 4 (of 4 total)

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 * 4 replies
 * 2 participants
 * Last reply from: [Amauri](https://wordpress.org/support/users/amauric/)
 * Last activity: [17 hours, 41 minutes ago](https://wordpress.org/support/topic/error-500-on-editing-posts/#post-19017313)
 * Status: not resolved