Ticket #20589: 20589.diff

src/wp-includes/ms-functions.php

@@ -1289 +1289 @@
  */
 function domain_exists($domain, $path, $site_id = 1) {
         global $wpdb;
+
+        $path = trailingslashit( $path );
+
         $result = $wpdb->get_var( $wpdb->prepare("SELECT blog_id FROM $wpdb->blogs WHERE domain = %s AND path = %s AND site_id = %d", $domain, $path, $site_id) );
         /**
          * Filter whether a blogname is taken.