fix clearing mounts when filesystem isn't initialized yet

diff --git a/lib/files/filesystem.php b/lib/files/filesystem.php
index 02cce001b481a29109c6d68e826414b003f011da..7e0bcfd1a27b76ff6751713751366abd3d07827e 100644 (file)
--- a/lib/files/filesystem.php
+++ b/lib/files/filesystem.php
@@ -359,7 +359,9 @@ class Filesystem {
         * clear all mounts and storage backends
         */
        public static function clearMounts() {
-               self::$mounts->clear();
+               if (self::$mounts) {
+                       self::$mounts->clear();
+               }
        }
 
        /**