Support » Plugin: WooCommerce UPC, EAN, and ISBN » Schema markup fatal error

  • Resolved Diego Versiani


    Hi Scott,

    The function added in the latest version (0.5.0) throws a fatal error when it is called on pages that are not product single pages, the functions try to get the global $product variable which is not available in those contexts.

    Below is the corrected function, I hope to see an update soon :). The changes were:

    – Added function access keyword to public
    – Added documentation to the function
    – Added the parameter $product which is passed by WooCommerce
    – Added a double safe check to return an unchanged $markup if the product variable is not available for some reason, which is unlikely to happen as WooCommerce will only call this function if the $product variable exists.
    – Removed the global $product declaration that was getting the product variable from the global context, hence why the error happened on not-product pages.

             * Adds GTIN field to product JSON-LD.
             * @since       0.5.0
             * @return      array    Modified WooCommerce product structured data.
            public function add_gtin_to_structured_data( $markup, $product ) {
    	    // Bail if product variable not available
    	    if ( ! $product ) { return $markup; }
                $product_id = $product->get_id();
                $gtin = get_post_meta( $product_id, 'hwp_product_gtin', 1 );
                $markup['gtin'] = trim($gtin);
                return $markup;


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