Title: PHP Warning: Undefined array key 1
Last modified: February 4, 2026

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# PHP Warning: Undefined array key 1

 *  [Justin](https://wordpress.org/support/users/jtphelan/)
 * (@jtphelan)
 * [2 months, 1 week ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-1-4/)
 * My error log file is filled with these errors.
 * `PHP Warning: Undefined array key 1 in /public_html/wp-content/plugins/routeapp/
   includes/tracking-providers/class-routeapp-shipstation.php on line 143`
   `PHP 
   Warning: Undefined array key 1 in /public_html/wp-content/plugins/routeapp/includes/
   tracking-providers/class-routeapp-shipstation.php on line 147`

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 * 0 replies
 * 1 participant
 * Last reply from: [Justin](https://wordpress.org/support/users/jtphelan/)
 * Last activity: [2 months, 1 week ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-1-4/)
 * Status: not resolved