diff --git a/source/Ox/js/Format.js b/source/Ox/js/Format.js
index 77a66378..b55485a4 100644
--- a/source/Ox/js/Format.js
+++ b/source/Ox/js/Format.js
@@ -559,9 +559,9 @@ Ox.formatDimensions <f> Formats valus as dimension
     "1,920 × 1,080 px"
 @*/
 Ox.formatDimensions = Ox.formatResolution = function(array, string) {
-    return array.map(function(value) {
+    return array ? array.map(function(value) {
         return Ox.formatNumber(value);
-    }).join(' × ') + (string ? ' ' + string : '');
+    }).join(' × ') + (string ? ' ' + string : '') : '';
 };
 
 /*@