Title: Fatal Error 2.5.4
Last modified: June 5, 2026

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# Fatal Error 2.5.4

 *  [wongjn](https://wordpress.org/support/users/wongjn/)
 * (@wongjn)
 * [1 week ago](https://wordpress.org/support/topic/fatal-error-2-5-4/)
 * When checking out, a PHP fatal error occurs:
 *     ```wp-block-code
       PHP Fatal error: Uncaught Error: Call to undefined method Woocommerce_Dynamic_Pricing_And_Discount_Pro_Public::wdpad_use_legacy_adjustment_discount_code__premium_only()
       ```
   
 * I have checked `[class-woocommerce-dynamic-pricing-and-discount-public.php](https://plugins.trac.wordpress.org/browser/woo-conditional-discount-rules-for-checkout/tags/2.5.4/public/class-woocommerce-dynamic-pricing-and-discount-public.php)`
   and indeed, there is no `wdpad_use_legacy_adjustment_discount_code__premium_only`
   method.

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 * ![](https://ps.w.org/woo-conditional-discount-rules-for-checkout/assets/icon-
   256x256.png?rev=3011371)
 * [Dynamic Pricing and Discount Rules for WooCommerce](https://wordpress.org/plugins/woo-conditional-discount-rules-for-checkout/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/woo-conditional-discount-rules-for-checkout/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/woo-conditional-discount-rules-for-checkout/)
 * [Active Topics](https://wordpress.org/support/plugin/woo-conditional-discount-rules-for-checkout/active/)
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 * 0 replies
 * 1 participant
 * Last reply from: [wongjn](https://wordpress.org/support/users/wongjn/)
 * Last activity: [1 week ago](https://wordpress.org/support/topic/fatal-error-2-5-4/)
 * Status: not resolved