Title: Undefined array key “HTTP_USER_AGENT”
Last modified: September 9, 2025

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# Undefined array key “HTTP_USER_AGENT”

 *  [dmac](https://wordpress.org/support/users/darrenmcentee/)
 * (@darrenmcentee)
 * [8 months, 2 weeks ago](https://wordpress.org/support/topic/undefined-array-key-http_user_agent-6/)
 * Hi, getting this output every few seconds in the error_log. Can you advise please?
 *     ```wp-block-code
       [08-Sep-2025 16:42:24 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:26 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:28 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:30 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:31 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:33 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:35 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:37 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:39 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:41 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:43 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156[08-Sep-2025 16:42:45 UTC] PHP Warning:  Undefined array key "HTTP_USER_AGENT" in /home/xyz/public_html/wp-content/plugins/woo-quick-view/classes/class.backend.php on line 156
       ```
   
 * Thank you,
   Darren.

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 * 0 replies
 * 1 participant
 * Last reply from: [dmac](https://wordpress.org/support/users/darrenmcentee/)
 * Last activity: [8 months, 2 weeks ago](https://wordpress.org/support/topic/undefined-array-key-http_user_agent-6/)
 * Status: not resolved