By markhalliwell on
Change record status: 
Published (View all published change records)
Project: 
JS Callback Handler
Introduced in branch: 
7.x-2.x
Introduced in version: 
7.x-2.2
Issue links: 
https://www.drupal.org/node/2835991
Description: 

Prior to this change, PHP errors and exceptions were either silently ignored or the response would fatal with printed HTML and break expected JSON in the ajax response.

Now, all PHP errors will be shown (respecting the site's PHP error display configuration) as an error type status message via drupal_set_message().

If your callbacks start showing errors you two options to proceed:

  1. Fix the errors.
  2. Add the following configuration variable to your settings.php file until you can do #1:
    $conf['js_silence_php_errors'] = TRUE;
Impacts: 
Module developers