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Looking for possible solutions, because I'm pretty much lost as to why it happens.

In WP Admin, all my pages, when I want to modify them, are OK. But one throws a 500 error.

What could be the problem? The same code is loaded in all pages, AFAIK.

So how can one 500, when the others are ok?

Plugins are:

  • ACF
  • Contact Form 7
  • oAuth Twitter feed for developers
  • Regenerate Thumbnails
  • Transient Manager
  • WP Mail Logging
  • WPML
  • Yoast
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  • 1
    ____which one ?
    – mmm
    Oct 27, 2017 at 14:29

2 Answers 2

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It means you have a PHP syntax error. You need to consult the logs or turn on debug mode. In wp-config.php in your root wordpress directory, find the line as follows:

define( 'WP_DEBUG', false );

and change it to:

define( 'WP_DEBUG', true );

Refresh your page that appears blank to find the error. If it still does not show up, it means you may need to change your php.ini settings to display errors.

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  • This is right. You could also just check the error log.
    – rudtek
    Oct 27, 2017 at 16:34
1

Found out what it was:

My ACF was writing a novel every time the page was saved, and because of the excess of heavy revisions it crashed.

I installed the WP-Sweep plugins, and swept the revisions.

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