Title: PHP Warning: Undefined array key 0
Last modified: November 15, 2025

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# PHP Warning: Undefined array key 0

 *  Resolved [Marc73](https://wordpress.org/support/users/marc73/)
 * (@marc73)
 * [4 months, 4 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-0-2/)
 * Hi. Before I create this topic, I have searched this forum for “PHP Warning: 
   Undefined array key 0 ” but got no results. I am getting this error in my logs.
 * _[15-Nov-2025 08:43:58 UTC] PHP Warning: Undefined array key 0 in /usr/www/users/
   mydomain/wp-content/plugins/wp-to-buffer/lib/includes/class-wp-to-social-pro-
   log.php on line 325_
    - WordPress Version: Version 6.8.3
    - WP to Buffer Version: Version: 4.0.5

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

 *  Plugin Author [wpzinc](https://wordpress.org/support/users/wpzinc/)
 * (@wpzinc)
 * [4 months, 3 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-0-2/#post-18721555)
 * Resolved in 4.0.6, available now.
 *  Thread Starter [Marc73](https://wordpress.org/support/users/marc73/)
 * (@marc73)
 * [4 months, 3 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-0-2/#post-18727511)
 * thank you WP Zinc
 * We are running the latest version of your plugin (4.0.6) and are experiencing
   a persistent PHP Warning that is flooding our error logs. This warning appears
   to be the bug you intended to fix in the 4.0.6 release.
 * The following warning is generated repeatedly in the PHP error log whenever the
   plugin runs, specifically the logging function:
 *     ```wp-block-code
       PHP Warning: Undefined array key 0 in /usr/www/users/mydomain/wp-content/plugins/wp-to-buffer/lib/includes/class-wp-to-social-pro-log.php on line 327
       ```
   
 * 📋 Environment Details
    - **Plugin Version:** 4.0.6 (Latest)
    - **PHP Version:** 8.4
    - **WordPress Version:** 6.8.3
    - **Caching:** Redis Object Cache is active.
 * 🔎 Troubleshooting Steps Already Taken
 * To rule out any environmental or data corruption issues, we have performed the
   following comprehensive steps, and the warning still persists:
    1. **Cache/Transient Cleanup:**
    2.  - Executed `wp cache flush` multiple times.
        - Executed `wp transient delete --all`.
    3. **Plugin Reset:**
    4.  - Deactivated and then immediately reactivated the WP to Buffer plugin via 
          WP-CLI (`wp plugin deactivate/activate`).
    5. **Forced Execution:**
    6.  - Manually ran the WordPress cron queue (`wp cron event run --due-now`) to 
          force background tasks (like logging/scheduling) to execute, confirming the
          error is immediately reproducible.
    7. **Configuration Check:**
    8.  - Re-saved all plugin settings in the WordPress admin panel.
 * Since the error persists after these steps, we believe this is an **unresolved
   bug in the plugin’s code logic (Line 327)** that may be triggered by specific
   data in our installation. Please investigate this line in version 4.0.6 for an
   unhandled array return or empty variable access.
 * Thank you for your urgent attention to this issue.

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

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## Tags

 * [array](https://wordpress.org/support/topic-tag/array/)
 * [php](https://wordpress.org/support/topic-tag/php/)
 * [undefined](https://wordpress.org/support/topic-tag/undefined/)
 * [warning](https://wordpress.org/support/topic-tag/warning/)

 * 2 replies
 * 2 participants
 * Last reply from: [Marc73](https://wordpress.org/support/users/marc73/)
 * Last activity: [4 months, 3 weeks ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-0-2/#post-18727511)
 * Status: resolved