diff --git a/src/wp-admin/includes/class-wp-screen.php b/src/wp-admin/includes/class-wp-screen.php
index 7b7290011c..61217462eb 100644
--- a/src/wp-admin/includes/class-wp-screen.php
+++ b/src/wp-admin/includes/class-wp-screen.php
@@ -212,6 +212,7 @@ final class WP_Screen {
 			return $hook_name;
 		}
 
+		$id              = '';
 		$post_type       = null;
 		$taxonomy        = null;
 		$in_admin        = false;
@@ -220,7 +221,7 @@ final class WP_Screen {
 
 		if ( $hook_name ) {
 			$id = $hook_name;
-		} else {
+		} elseif ( ! empty( $GLOBALS['hook_suffix'] ) ) {
 			$id = $GLOBALS['hook_suffix'];
 		}