Title: Error 500
Last modified: November 30, 2017

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# Error 500

 *  Resolved [wjweb](https://wordpress.org/support/users/wjweb/)
 * (@wjweb)
 * [8 years, 6 months ago](https://wordpress.org/support/topic/error-500-56/)
 * After updating to WP 4.9.1 my website doesn’t load anymore. An error 500, and
   when i check my error logs, i see this line:
 * Premature end of script headers: index.php, referer: [https://www.wjwebdesign.nl/?ao_speedup_cachebuster=61368](https://www.wjwebdesign.nl/?ao_speedup_cachebuster=61368)
 * i am assuming the ao stands for Autoptimize, so I renamed the plugin, whole plugin
   folder, deleted the cache folders, uploaded a new .htaccess, and so on. The problem
   persists. Any idea how i can solve this?
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-500-56%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * (@optimizingmatters)
 * [8 years, 6 months ago](https://wordpress.org/support/topic/error-500-56/#post-9736559)
 * morrege [@wjweb](https://wordpress.org/support/users/wjweb/);
    the entry in your
   php errorlog (which is from Autoptimize’s cache preloader by doing a simple request
   for your homepage, which is triggered after a cache purge) is a consequence of
   the HTTP 500 error. this is confirmed by the fact that your server error doens’t
   go away by disabling AO.
 * next step will have to be disabling your plugins one by one and/ or briefly switching
   themes to find out which one is actually killing your site.
 * hope this helps,
    frank

Viewing 1 replies (of 1 total)

The topic ‘Error 500’ is closed to new replies.

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 * 1 reply
 * 2 participants
 * Last reply from: [Optimizing Matters](https://wordpress.org/support/users/optimizingmatters/)
 * Last activity: [8 years, 6 months ago](https://wordpress.org/support/topic/error-500-56/#post-9736559)
 * Status: resolved