Title: error Warning: Undefined array key
Last modified: June 12, 2023

---

# error Warning: Undefined array key

 *  Resolved [eeeeeeehsan](https://wordpress.org/support/users/eeeeeeehsan/)
 * (@eeeeeeehsan)
 * [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/)
 * Hello everyone.
 * I found that the two plugins “NOWPayments” and “CryptoPay WooCommerce,” are not
   compatible with each other. Whenever I activate the NOWPayments plugin, it triggers
   an error that affects several other plugins on my website. I have attached an
   image that shows the error message for your reference.
 * Error:
   **Warning**: Undefined array key “slug” in **/home/ieltsnob/public_html/
   wp-content/plugins/nowpayments-for-woocommerce/includes/class-npwc-init.php**
   on line **140**
 * ![](https://i0.wp.com/ielts-nobel.com/wp-content/uploads/2023/06/2023-06-12_20-
   26-50.png?ssl=1)
    -  This topic was modified 3 years ago by [eeeeeeehsan](https://wordpress.org/support/users/eeeeeeehsan/).
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ferror-warning-undefined-array-key%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 6 replies - 1 through 6 (of 6 total)

 *  [Syed Muhammad Usman](https://wordpress.org/support/users/smusman98/)
 * (@smusman98)
 * [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/#post-16815675)
 * HI there 👋,
 * I hope you are doing well 😀.
   Thanks for reporting the issue, we are looking 
   into it and will fix it asap.
 * Thanks
   Syed Muhammad Usman
 *  Thread Starter [eeeeeeehsan](https://wordpress.org/support/users/eeeeeeehsan/)
 * (@eeeeeeehsan)
 * [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/#post-16817193)
 * Thank you. Is there anything I can do to fix the issue sooner?
 *  [Syed Muhammad Usman](https://wordpress.org/support/users/smusman98/)
 * (@smusman98)
 * [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/#post-16819162)
 * Hi there,
 * We’ve no need to do anything, we’ve pushed the release, just update the plugin,
   to fetch and update to latest version go through the blog.
 * [How to Update WordPress Plugin?](https://coderpress.co/2023/06/14/how-to-update-wordpress-plugin/)
 * Thanks
   Syed Muhammad Usman
 *  Thread Starter [eeeeeeehsan](https://wordpress.org/support/users/eeeeeeehsan/)
 * (@eeeeeeehsan)
 * [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/#post-16819771)
 * Hi
 * The errors are gone!
 * Thank you for your prompt support!
 *  [Syed Muhammad Usman](https://wordpress.org/support/users/smusman98/)
 * (@smusman98)
 * [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/#post-16822919)
 * Hi,
 * You’re welcome, writing 5 Stars review will be very helpful for us 😀.
 * Thanks
   Syed Muhammad Usman
 *  Thread Starter [eeeeeeehsan](https://wordpress.org/support/users/eeeeeeehsan/)
 * (@eeeeeeehsan)
 * [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/#post-16823739)
 * Sure. I will do that.

Viewing 6 replies - 1 through 6 (of 6 total)

The topic ‘error Warning: Undefined array key’ is closed to new replies.

 * ![](https://ps.w.org/nowpayments-for-woocommerce/assets/icon-128x128.png?rev=
   2780315)
 * [NOWPayments for WooCommerce – Crypto Payment Gateway](https://wordpress.org/plugins/nowpayments-for-woocommerce/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/nowpayments-for-woocommerce/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/nowpayments-for-woocommerce/)
 * [Active Topics](https://wordpress.org/support/plugin/nowpayments-for-woocommerce/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/nowpayments-for-woocommerce/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/nowpayments-for-woocommerce/reviews/)

## Tags

 * [crypto](https://wordpress.org/support/topic-tag/crypto/)

 * 6 replies
 * 2 participants
 * Last reply from: [eeeeeeehsan](https://wordpress.org/support/users/eeeeeeehsan/)
 * Last activity: [3 years ago](https://wordpress.org/support/topic/error-warning-undefined-array-key/#post-16823739)
 * Status: resolved