diff --git a/wp-includes/theme.php b/wp-includes/theme.php
index 6cef26f8b..e6a6f2859 100644
--- a/wp-includes/theme.php
+++ b/wp-includes/theme.php
@@ -175,7 +175,8 @@ function get_themes() {
 			}
 		}
 	}
-	@closedir($theme_dir);
+	if ( is_dir( $theme_dir ) )
+		@closedir( $theme_dir );
 
 	if ( !$themes_dir || !$theme_files )
 		return $themes;