If you’re building a theme which supports but doesn’t require WooCommerce, you may want to wrap WooCommerce functionality (think cart links etc) inside a conditional query. That way, if WooCommerce isn’t activated, the functionality is simply ignored instead of producing fatal errors.

Add this code to your child theme’s functions.php file or via a plugin that allows custom functions to be added, such as the Dessky Snippets plugin. Please don’t add custom code directly to your parent theme’s functions.php file as this will be overwritten completely when you update the theme.

/**
 * Check if WooCommerce is activated
 */
if ( ! function_exists( 'is_woocommerce_activated' ) ) {
	function is_woocommerce_activated() {
		if ( class_exists( 'woocommerce' ) ) { return true; } else { return false; }
	}
}