diff --git src/wp-includes/ms-load.php src/wp-includes/ms-load.php
index 868c141..1dd0880 100644
--- src/wp-includes/ms-load.php
+++ src/wp-includes/ms-load.php
@@ -125,9 +125,11 @@ function get_current_site_name( $current_site ) {
 	$current_site->site_name = wp_cache_get( $current_site->id . ':site_name', 'site-options' );
 	if ( ! $current_site->site_name ) {
 		$current_site->site_name = $wpdb->get_var( $wpdb->prepare( "SELECT meta_value FROM $wpdb->sitemeta WHERE site_id = %d AND meta_key = 'site_name'", $current_site->id ) );
-		if ( ! $current_site->site_name )
+		if ( ! $current_site->site_name ) {
 			$current_site->site_name = ucfirst( $current_site->domain );
-		wp_cache_set( $current_site->id . ':site_name', $current_site->site_name, 'site-options' );
+		} else {
+			wp_cache_set( $current_site->id . ':site_name', $current_site->site_name, 'site-options' );
+		}
 	}
 
 	return $current_site;