Title: Fatal error – Undefined variable $default_express_show_in_ch
Last modified: August 6, 2026

---

# Fatal error – Undefined variable $default_express_show_in_ch

 *  [absdhiten](https://wordpress.org/support/users/absdhiten/)
 * (@absdhiten)
 * [2 days, 16 hours ago](https://wordpress.org/support/topic/fatal-error-undefined-variable-default_express_show_in_ch/)
 * After updating to the latest version of the plugin, one of our production websites
   started showing a critical error, making the entire site inaccessible.
 * After debugging, we traced the issue to an undefined variable in the plugin.
 * The variable:
 *     ```wp-block-code
       $default_express_show_in_checkout
       ```
   
 * is being used before it is initialized, which results in:
 *     ```wp-block-code
       PHP Warning: Undefined variable $default_express_show_in_checkout
       ```
   
 * On servers where warnings/notices are treated as fatal (or displayed), this causes
   the website to break.
   ERROR:
 * ![](https://wordpress.org/304ccaef-6113-4e69-8ebf-c93035031426)

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

 *  Plugin Author [Iver Odin Kvello](https://wordpress.org/support/users/iverok/)
 * (@iverok)
 * [2 days, 15 hours ago](https://wordpress.org/support/topic/fatal-error-undefined-variable-default_express_show_in_ch/#post-18985552)
 * Thanks for reporting, we’ll release a fix as soon as possible.
 *  Plugin Author [Iver Odin Kvello](https://wordpress.org/support/users/iverok/)
 * (@iverok)
 * [2 days, 15 hours ago](https://wordpress.org/support/topic/fatal-error-undefined-variable-default_express_show_in_ch/#post-18985562)
 * We are pushing 6.1.1 to wp.org right now. Since review can take a bit of time,
   you can get the latest version from github:
 * [https://github.com/vippsas/vipps-woocommerce/releases/tag/v6.1.1](https://github.com/vippsas/vipps-woocommerce/releases/tag/v6.1.1)

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

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 * 2 replies
 * 2 participants
 * Last reply from: [Iver Odin Kvello](https://wordpress.org/support/users/iverok/)
 * Last activity: [2 days, 15 hours ago](https://wordpress.org/support/topic/fatal-error-undefined-variable-default_express_show_in_ch/#post-18985562)
 * Status: not resolved