Reply To: Problems processing orders after update to 7.6.0

Try to add the following PHP code snippet to the child theme functions.php file to fix this

if ( ! function_exists( 'woodmart_enqueue_emails_styles' ) ) {
	/**
	 * Add custom CSS for Woodmart emails.
	 *
	 * @param string $css WooCommerce email CSS code.
	 *
	 * @return string
	 */
	function woodmart_enqueue_emails_styles( $css ) {
		ob_start();
		wc_get_template( 'emails/wd-email-styles.php' );
		$css .= ob_get_clean();

		return $css;
	}

	add_filter( 'woocommerce_email_styles', 'woodmart_enqueue_emails_styles', 20, 2 );
}