diff --git a/Viewer/features/filesystem.js b/Viewer/features/filesystem.js
index ff7fda42..57b3f43f 100755
--- a/Viewer/features/filesystem.js
+++ b/Viewer/features/filesystem.js
@@ -2283,7 +2283,7 @@ var FileSystemWriterActions = actions.Actions({
 					// update previews...
 					// NOTE: this is needed if some of the previews are the 
 					// 		same as .path
-					Object.keys(img.preview)
+					Object.keys(img.preview || {})
 						.forEach(function(s){ 
 							var p = img.preview[s]
 							img.preview[s] = p == from_path ?