Title: PHP error
Last modified: February 5, 2023

---

# PHP error

 *  Resolved [Seath](https://wordpress.org/support/users/seath/)
 * (@seath)
 * [3 years, 4 months ago](https://wordpress.org/support/topic/php-error-571/)
 * Hello, I keep getting this PHP error ….
 *     ```wp-block-code
       Warning: Undefined array key "HTTP_USER_AGENT" in /wp-content/plugins/all-in-one-wp-security-and-firewall/classes/firewall/rule/rules/blacklist/rule-user-agent-blacklist.php on line 50
       ```
   

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

 *  Plugin Support [hjogiupdraftplus](https://wordpress.org/support/users/hjogiupdraftplus/)
 * (@hjogiupdraftplus)
 * [3 years, 4 months ago](https://wordpress.org/support/topic/php-error-571/#post-16441741)
 * Hi [@seath](https://wordpress.org/support/users/seath/)
 * This is known issue and we have resolved it already in our local, upcoming release
   will have this resolved in wordpress.org AIOS plugin.
 * Regards
 *  Thread Starter [Seath](https://wordpress.org/support/users/seath/)
 * (@seath)
 * [3 years, 4 months ago](https://wordpress.org/support/topic/php-error-571/#post-16441766)
 * Ok tthanks

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

The topic ‘PHP error’ is closed to new replies.

 * ![](https://ps.w.org/all-in-one-wp-security-and-firewall/assets/icon-256x256.
   png?rev=2798307)
 * [All-In-One Security (AIOS) – Security and Firewall](https://wordpress.org/plugins/all-in-one-wp-security-and-firewall/)
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 * 2 replies
 * 2 participants
 * Last reply from: [Seath](https://wordpress.org/support/users/seath/)
 * Last activity: [3 years, 4 months ago](https://wordpress.org/support/topic/php-error-571/#post-16441766)
 * Status: resolved