Title: Plugin Caused Site Failure
Last modified: November 2, 2022

---

# Plugin Caused Site Failure

 *  Resolved [rizekna](https://wordpress.org/support/users/rizekna/)
 * (@rizekna)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-caused-site-failure/)
 * I have had WP Super Cache for two years with no issues. Today I got an email 
   with the error below and I called Bluehost who deactivated the plugin. My site
   was completely down until they deactivated the WP Super Cache plugin. They advised
   that it was caused my site to go down. They also advised to reach out to the 
   Developer to see why this happened. Please advise.
 *     ```
       Error Details
       =============
       An error of type E_ERROR was caused in line 49 of the file /home1/ointiimy/public_html/wp-content/plugins/jetpack/functions.is-mobile.php. Error message: Uncaught Error: Class 'Automattic\Jetpack\Device_Detection' not found in /home1/ointiimy/public_html/wp-content/plugins/jetpack/functions.is-mobile.php:49
       Stack trace:
       #0 /home1/ointiimy/public_html/wp-content/plugins/wp-super-cache/plugins/jetpack.php(76): jetpack_is_mobile()
       #1 /home1/ointiimy/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php(517): wp_super_cache_jetpack_cookie_check('marginofbeauty....')
       #2 /home1/ointiimy/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php(550): do_cacheaction('wp_cache_check_...', 'marginofbeauty....')
       #3 /home1/ointiimy/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php(32): wp_cache_check_mobile('marginofbeauty....')
       #4 /home1/ointiimy/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php(85): get_wp_cache_key()
       #5 /home1/ointiimy/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php(352): wp_super_cache_init()
       #6 /home1/ointiimy/public_html/wp-settings.php(451): wp_cache_postload()
       #7 /home1/ointiimy
       ```
   
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fplugin-caused-site-failure%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Contributor [Mark (a11n)](https://wordpress.org/support/users/thingalon/)
 * (@thingalon)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-caused-site-failure/#post-16154781)
 * Hi [@rizekna](https://wordpress.org/support/users/rizekna/),
 * Thank you for writing in about this issue.
 * Jetpack 11.5 was recently released, and it appears there’s a conflict between
   it and the way Super Cache’s “Jetpack Mobile Themes” feature was implemented.
 * I’ve just released a fix for Super Cache in version 1.9.1, so it should be safe
   to install that version.
 * Thanks again for letting us know about the issue you ran into.
 *  Thread Starter [rizekna](https://wordpress.org/support/users/rizekna/)
 * (@rizekna)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-caused-site-failure/#post-16158274)
 * Thank you. I already have that version. Should I delete it and reinstall it?
 *  Plugin Contributor [Mark (a11n)](https://wordpress.org/support/users/thingalon/)
 * (@thingalon)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-caused-site-failure/#post-16179617)
 * Hi [@rizekna](https://wordpress.org/support/users/rizekna/),
 * Apologies for my late response.
 * I released WP Super Cache 1.9.1 after you reported the issue last week. I suspect
   your WordPress site has auto-updated to version 1.9.1.
 * Provided you have 1.9.1 installed, it should be safe to reactivate the plugin
   now.
 * Please let me know if you run into any troubles!

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘Plugin Caused Site Failure’ is closed to new replies.

 * ![](https://ps.w.org/wp-super-cache/assets/icon-256x256.png?rev=3506220)
 * [WP Super Cache](https://wordpress.org/plugins/wp-super-cache/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-super-cache/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-super-cache/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-super-cache/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-super-cache/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-super-cache/reviews/)

 * 3 replies
 * 2 participants
 * Last reply from: [Mark (a11n)](https://wordpress.org/support/users/thingalon/)
 * Last activity: [3 years, 6 months ago](https://wordpress.org/support/topic/plugin-caused-site-failure/#post-16179617)
 * Status: resolved