Title: conflict with WP OPTIMIZE
Last modified: March 29, 2020

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# conflict with WP OPTIMIZE

 *  [KR. Laboratories](https://wordpress.org/support/users/krashlab/)
 * (@krashlab)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/conflict-with-wp-optimize/)
 * hi!
 * If turn on the “WP OPTIMIZE” plugin with “WP-FFPC” enabled, the redirect of pages
   with a slash to without does not work. WordPress displaying warning:
 * Warning: call_user_func_array() expects parameter 1 to be a valid callback, function‘
   wp_ffpc_redirect_callback’ not found or invalid function name in /home/k/user/
   website/public_html/wp-includes/class-wp-hook.php on line 288
 * When you turn off one of them, everything works correctly. I can’t understand
   yet why they conflict and how to solve it.
 * Please, need support.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fconflict-with-wp-optimize%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [KR. Laboratories](https://wordpress.org/support/users/krashlab/)
 * (@krashlab)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/conflict-with-wp-optimize/#post-12600964)
 * I solved this problem – add in .htaccess 301 rediret manually from non-slash 
   to slash URLs:
 * <IfModule mod_rewrite.c>
    RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-
   f RewriteRule ^(.*[^/])$ /$1/ [L,R=301]
 * </IfModule>
 * But I don’t think this is the perfect solution for this problem. Web developers
   need to test this case, because it occurs on absolutely all sites with WP-FFPC
   + WP-OPTIMIZE
    -  This reply was modified 6 years, 1 month ago by [KR. Laboratories](https://wordpress.org/support/users/krashlab/).
    -  This reply was modified 6 years, 1 month ago by [KR. Laboratories](https://wordpress.org/support/users/krashlab/).
    -  This reply was modified 6 years, 1 month ago by [KR. Laboratories](https://wordpress.org/support/users/krashlab/).
 *  Thread Starter [KR. Laboratories](https://wordpress.org/support/users/krashlab/)
 * (@krashlab)
 * [6 years, 1 month ago](https://wordpress.org/support/topic/conflict-with-wp-optimize/#post-12601286)
 * I would like to add more information to this issue. I noticed, that this problem
   with redirect occurs through the advanced-cache.php file. If in WP-FFPC plugin
   Save changes again – this file starts working correct and there are no problems.
   I think it’s a bug. Please, fix it.
    -  This reply was modified 6 years, 1 month ago by [KR. Laboratories](https://wordpress.org/support/users/krashlab/).

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘conflict with WP OPTIMIZE’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/wp-ffpc_ffffff.svg)
 * [WP-FFPC](https://wordpress.org/plugins/wp-ffpc/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-ffpc/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-ffpc/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-ffpc/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-ffpc/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-ffpc/reviews/)

## Tags

 * [conflict](https://wordpress.org/support/topic-tag/conflict/)

 * 2 replies
 * 1 participant
 * Last reply from: [KR. Laboratories](https://wordpress.org/support/users/krashlab/)
 * Last activity: [6 years, 1 month ago](https://wordpress.org/support/topic/conflict-with-wp-optimize/#post-12601286)
 * Status: not resolved