diff --git a/src/wp-includes/wp-db.php b/src/wp-includes/wp-db.php
index 04fa15c1ee..340a6f5861 100644
--- a/src/wp-includes/wp-db.php
+++ b/src/wp-includes/wp-db.php
@@ -1158,7 +1158,7 @@ class wpdb {
 	 * @return string Escaped string.
 	 */
 	function _real_escape( $string ) {
-		if ( ! is_scalar( $string ) && ! is_null( $string ) ) {
+		if ( ! is_scalar( $string ) ) {
 			return '';
 		}