Title: WP Super Cache causing problems in WordPress 4.7 Last modified: December 7, 2016 --- # WP Super Cache causing problems in WordPress 4.7 * [yngvai](https://wordpress.org/support/users/yngvai/) * (@yngvai) * [9 years, 6 months ago](https://wordpress.org/support/topic/wp-super-cache-causing-problems-in-wordpress-4-7/) * When I would try to customize my theme, I would get the following error message: * “Cheatin’ uh? This changeset has already been published and cannot be further modified.” * This was happening with every single WordPress theme, so it was not a problem with the theme itself. * I deactivated all plugins and then re-activated one by one, and it turns out that WP Super Cache was causing this issue. Viewing 5 replies - 1 through 5 (of 5 total) * [Jamesits](https://wordpress.org/support/users/jamesits/) * (@jamesits) * [9 years, 6 months ago](https://wordpress.org/support/topic/wp-super-cache-causing-problems-in-wordpress-4-7/#post-8527626) * I got something like this on every of my WordPress 4.7 sites with WP Super Cache enabled: * ``` Warning: Illegal string offset 'uri' in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 861 Warning: Illegal string offset 'blog_id' in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 862 Warning: Illegal string offset 'post' in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 863 Warning: Illegal string offset 'key' in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 864 Warning: Illegal string offset 'headers' in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 870 Fatal error: Uncaught Error: Cannot use string offset as an array in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php:870 Stack trace: #0 /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php(314): wp_cache_shutdown_callback() #1 [internal function]: wp_cache_ob_callback('...', 9) #2 /var/www/html/wp-includes/functions.php(3673): ob_end_flush() #3 /var/www/html/wp-includes/class-wp-hook.php(298): wp_ob_end_flush_all('') #4 /var/www/html/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters('', Array) #5 /var/www/html/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #6 /var/www/html/wp-includes/load.php(670): do_action('shutdown') #7 [internal function]: shutdown_action_hook() #8 {main} thrown in /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 870 ``` * Seems there are some serious compatibility issues. * [doume](https://wordpress.org/support/users/doume/) * (@doume) * [9 years, 6 months ago](https://wordpress.org/support/topic/wp-super-cache-causing-problems-in-wordpress-4-7/#post-8538301) * Hello, * [@jamesits](https://wordpress.org/support/users/jamesits/) With my configuration for this plugin (PHP mode, no mobile support, no CDN, no preload and no extension): . I have the same last two lines (among others) when testing with the combo PHP7.1.0 + WP4.7 and the cache doesn’t work correctly. . I didn’t find problems with the combo PHP7.0.13 + WP4.7 I now use. * D. - This reply was modified 9 years, 6 months ago by [doume](https://wordpress.org/support/users/doume/). - This reply was modified 9 years, 6 months ago by [doume](https://wordpress.org/support/users/doume/). * [Jamesits](https://wordpress.org/support/users/jamesits/) * (@jamesits) * [9 years, 6 months ago](https://wordpress.org/support/topic/wp-super-cache-causing-problems-in-wordpress-4-7/#post-8539090) * Yes, downgraded to PHP 7.0 and it worked fine. I forgot when I upgrade my Docker image for WP 4.7, PHP is also upgraded. Sorry for this. * [doume](https://wordpress.org/support/users/doume/) * (@doume) * [9 years, 5 months ago](https://wordpress.org/support/topic/wp-super-cache-causing-problems-in-wordpress-4-7/#post-8563308) * According to the [github reposetory](https://github.com/Automattic/wp-super-cache/pull/158/commits/9c0750e88236a51374e54f8341953b267c5c31f8) the problem with PHP 7.1 has been fixed. I had a look and it is now available in the [development ](https://wordpress.org/plugins/wp-super-cache/developers/) version. * Edit : development version works on local PHP7.1.0 + WP4.7 server. - This reply was modified 9 years, 5 months ago by [doume](https://wordpress.org/support/users/doume/). - This reply was modified 9 years, 5 months ago by [doume](https://wordpress.org/support/users/doume/). * [FolioVision](https://wordpress.org/support/users/foliovision/) * (@foliovision) * [9 years, 5 months ago](https://wordpress.org/support/topic/wp-super-cache-causing-problems-in-wordpress-4-7/#post-8570214) * Thanks for the fix Doume. We’ll be careful with PHP 7.1 for now. * To original poster [@yngvai](https://wordpress.org/support/users/yngvai/): It’s a little tough rolling your own WordPress membership site, without any developer help James Krieger. A little bit of gratitude to those who answered you and solved the issue would not go amiss. Viewing 5 replies - 1 through 5 (of 5 total) The topic ‘WP Super Cache causing problems in WordPress 4.7’ 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/) ## Tags * [PHP7](https://wordpress.org/support/topic-tag/php7/) * 5 replies * 4 participants * Last reply from: [FolioVision](https://wordpress.org/support/users/foliovision/) * Last activity: [9 years, 5 months ago](https://wordpress.org/support/topic/wp-super-cache-causing-problems-in-wordpress-4-7/#post-8570214) * Status: not resolved