diff --git a/includes/class-wc-calypso-bridge-customize-store.php b/includes/class-wc-calypso-bridge-customize-store.php
index 20085752..efdee453 100644
--- a/includes/class-wc-calypso-bridge-customize-store.php
+++ b/includes/class-wc-calypso-bridge-customize-store.php
@@ -44,7 +44,7 @@ private function __construct() {
 		// wpcom.editor.js conflicts with CYS scripts due to double registration of the private-apis
 		// dequeue it on CYS pages.
 		add_action( 'admin_print_scripts', function() {
-			if ( str_contains( wp_unslash( $_GET['path'] ), '/customize-store/' ) ) {
+			if ( isset( $_GET['path'] ) && str_contains( wp_unslash( $_GET['path'] ), '/customize-store/' ) ) { // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
 				wp_dequeue_script( 'wpcom-block-editor-wpcom-editor-script' );
 			}
 		}, 9999);