Fallback to home URL if no shop page is set for system status security check.

Fixes #13921

includes/api/class-wc-rest-system-status-controller.php

@@ -844,8 +844,9 @@ class WC_REST_System_Status_Controller extends WC_REST_Controller {
 	 * @return array
 	 */
 	public function get_security_info() {
+		$check_page = wc_get_page_id( 'shop' ) ? get_permalink( wc_get_page_id( 'shop' ) ) : get_home_url();
 		return array(
-			'secure_connection' => 'https' === substr( get_permalink( wc_get_page_id( 'shop' ) ), 0, 5 ),
+			'secure_connection' => 'https' === substr( $check_page, 0, 5 ),
 			'hide_errors'       => ! ( defined( 'WP_DEBUG' ) && defined( 'WP_DEBUG_DISPLAY' ) && WP_DEBUG && WP_DEBUG_DISPLAY ) || 0 === intval( ini_get( 'display_errors' ) ),
 		);
 	}