Title: WP STAGING optimizer MU plugin uses outdated path / open_basedir warnings
Last modified: November 21, 2025

---

# WP STAGING optimizer MU plugin uses outdated path / open_basedir warnings

 *  Resolved [Dominik](https://wordpress.org/support/users/elexpress/)
 * (@elexpress)
 * [6 months, 2 weeks ago](https://wordpress.org/support/topic/wp-staging-optimizer-mu-plugin-uses-outdated-blank-theme-path-causing-open_base/)
 * Current MU plugin (v1.5.5) points to /Backend/Optimizer/blank-theme/functions.
   php, which no longer exists; active plugin (v1.6.0) ships blank theme in /resources/
   blank-theme/functions.php. When the filter returns an empty path, WP loads “/
   functions.php” and “/theme.json”, triggering `file_exists(): open_basedir restriction
   in effect` (sanitized paths).
 * Please update the shipped MU plugin to the current version or adjust the path
   to /resources/blank-theme so open_basedir warnings stop.
    -  This topic was modified 6 months, 2 weeks ago by [Dominik](https://wordpress.org/support/users/elexpress/).
    -  This topic was modified 6 months, 2 weeks ago by [Dominik](https://wordpress.org/support/users/elexpress/).

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

 *  Plugin Contributor [alaasalama](https://wordpress.org/support/users/alaasalama/)
 * (@alaasalama)
 * [6 months, 1 week ago](https://wordpress.org/support/topic/wp-staging-optimizer-mu-plugin-uses-outdated-blank-theme-path-causing-open_base/#post-18731011)
 * Hi [@elexpress](https://wordpress.org/support/users/elexpress/) 
   I double-checked,
   and can confirm that the mu-plugin “wp-staging-optimizer” that comes with the
   latest version of WP STAGING 4.3.2 is “1.6.0”, that has no problem with the blank-
   theme path.
 * Can you confirm you are running the latest version of WP STAGING plugin 4.3.2?
   Or the issue you have is that although you are running WP STAGING 4.3.2, “wp-
   staging-optimizer” is still on “1.5.5”? If that’s the case maybe uninstalling
   and re-installing the plugin would help?
 * Keep me updated and feel free to share the system information file from (WP STAGING
   > System info) via [this form](https://wp-staging.com/contact-us-presale-and-premium-support/),
   and I’ll investigate this from there.
 * Thanks, 
   Alaa
 *  Thread Starter [Dominik](https://wordpress.org/support/users/elexpress/)
 * (@elexpress)
 * [6 months, 1 week ago](https://wordpress.org/support/topic/wp-staging-optimizer-mu-plugin-uses-outdated-blank-theme-path-causing-open_base/#post-18731201)
 * Hi [@alaasalama](https://wordpress.org/support/users/alaasalama/)! Thank you 
   for the information! I have installed version 4.3.2 of WP STAGING WordPress Backup
   Plugin – Backup Duplicator, but the MU plugin still shows me version 1.5.5. Could
   it be that this was not automatically updated with an update of the WordPress
   plugin? I have had the plugin since October 2023. WP version is 6.8.3. WP version
   is 6.8.3. The mu-plugins folder has write permissions drwxr-xr-x (755).
 * After reinstalling, I now also have MU plugin v. 1.6.
    -  This reply was modified 6 months, 1 week ago by [Dominik](https://wordpress.org/support/users/elexpress/).
 *  Plugin Contributor [alaasalama](https://wordpress.org/support/users/alaasalama/)
 * (@alaasalama)
 * [6 months, 1 week ago](https://wordpress.org/support/topic/wp-staging-optimizer-mu-plugin-uses-outdated-blank-theme-path-causing-open_base/#post-18732129)
 * Hi [@elexpress](https://wordpress.org/support/users/elexpress/)
 * So now you have the correct mu-plugin version 1.6.0, that’s great.
 * Do you remember from which version you were updating the plugin from? Such information
   should be there in the system information (WP STAGING > System Info), that’s 
   why I would appreciate it if you can share it with me via [this form](https://wp-staging.com/contact-us-presale-and-premium-support/)
   and link to this thread.
 * That way I’ll be able to report this issue to our dev team, looks like when updating
   the plugin from an old version to the recent version, the mu-plugin didn’t get
   updated on your site.
 * Thanks, 
   Alaa

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

The topic ‘WP STAGING optimizer MU plugin uses outdated path / open_basedir warnings’
is closed to new replies.

 * ![](https://ps.w.org/wp-staging/assets/icon-256x256.png?rev=2972932)
 * [WP STAGING - WordPress Backup, Restore & Migration](https://wordpress.org/plugins/wp-staging/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/wp-staging/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/wp-staging/)
 * [Active Topics](https://wordpress.org/support/plugin/wp-staging/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/wp-staging/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/wp-staging/reviews/)

 * 3 replies
 * 2 participants
 * Last reply from: [alaasalama](https://wordpress.org/support/users/alaasalama/)
 * Last activity: [6 months, 1 week ago](https://wordpress.org/support/topic/wp-staging-optimizer-mu-plugin-uses-outdated-blank-theme-path-causing-open_base/#post-18732129)
 * Status: resolved