1 files changed, 4 insertions, 0 deletions
diff --git a/lib/helper.php b/lib/helper.php
index e7c9ac8015d..7f34d895821 100644
--- a/lib/helper.php
+++ b/lib/helper.php
@@ -223,6 +223,10 @@ class OC_Helper {
 	 * Makes 2048 to 2 kB.
 	 */
 	public static function humanFileSize( $bytes ) {
+		if( $bytes < 0 ) {
+			$l = OC_L10N::get('lib');
+			return $l->t("couldn't be determined");
+		}
 		if( $bytes < 1024 ) {
 			return "$bytes B";
 		}