PHP Notice: Undefined index: HTTP_USER_AGENT

  • From what is this error ?
    [15-Apr-2020 04:30:09 UTC] PHP Notice: Undefined index: HTTP_USER_AGENT in /home/webtouri/public_html/wp-content/plugins/seo-redirection/common/util.php on line 365
    [15-Apr-2020 04:30:09 UTC] PHP Notice: Undefined index: HTTP_USER_AGENT in /home/webtouri/public_html/wp-content/plugins/seo-redirection/common/util.php on line 445

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