Title: Fatal error – undefined function is_plugin_active()
Last modified: September 3, 2021

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# Fatal error – undefined function is_plugin_active()

 *  Resolved [shado3225](https://wordpress.org/support/users/shado3225/)
 * (@shado3225)
 * [4 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-undefined-function-is_plugin_active/)
 * FYI to the devs.
 * After the latest update this plugin broke the Woocommerce checkout page.
 * I have reverted to the previous version for now and will look into it after the
   devs have rolled out the next update.
 * Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in
   xxx/wp-content/plugins/woo-delivery/public/class-coderockz-woo-delivery-public.
   php:1239
    Stack trace: #0 xxx/wp-includes/class-wp-hook.php(303): Coderockz_Woo_Delivery_Public-
   >coderockz_woo_delivery_prevent_field_value_change(‘<p class=”form-…’, ‘coderockz_woo_d…’,
   Array, ”) #1 xxx/wp-includes/plugin.php(189): WP_Hook->apply_filters(‘<p class
   =”form-…’, Array) #2 xxx/wp-content/plugins/woocommerce/includes/wc-template-
   functions.php(2934): apply_filters(‘woocommerce_for…’, ‘<p class=”form-…’, ‘coderockz_woo_d…’,
   Array, ”) #3 xxx/wp-content/plugins/woo-delivery/public/class-coderockz-woo-delivery-
   public.php(303): woocommerce_form_field(‘coderockz_woo_d…’, Array, ”) #4 xxx/
   wp-includes/class-wp-hook.php(303): Coderockz_Woo_Delivery_Public->codero in 
   xxx/wp-content/plugins/woo-delivery/public/class-coderockz-woo-delivery-public.
   php on line 1239

Viewing 1 replies (of 1 total)

 *  Plugin Author [shoroar](https://wordpress.org/support/users/shoroar/)
 * (@shoroar)
 * [4 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-undefined-function-is_plugin_active/#post-14837705)
 * Hello [@shado3225](https://wordpress.org/support/users/shado3225/)
 * Please update the plugin. We just released a new version with the fix.
 * Thank you for informing us.

Viewing 1 replies (of 1 total)

The topic ‘Fatal error – undefined function is_plugin_active()’ is closed to new
replies.

 * ![](https://ps.w.org/woo-delivery/assets/icon-256x256.png?rev=2421326)
 * [Delivery & Pickup Date Time for WooCommerce](https://wordpress.org/plugins/woo-delivery/)
 * [Support Threads](https://wordpress.org/support/plugin/woo-delivery/)
 * [Active Topics](https://wordpress.org/support/plugin/woo-delivery/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/woo-delivery/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/woo-delivery/reviews/)

 * 1 reply
 * 2 participants
 * Last reply from: [shoroar](https://wordpress.org/support/users/shoroar/)
 * Last activity: [4 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-undefined-function-is_plugin_active/#post-14837705)
 * Status: resolved