bugfix.

diff --git a/skins/photo_lightbox_viewer.js b/skins/photo_lightbox_viewer.js
index 97c7f79..3438151 100644 (file)
--- a/skins/photo_lightbox_viewer.js
+++ b/skins/photo_lightbox_viewer.js
@@ -482,10 +482,10 @@ Lightbox.prototype.onDragStart = function(evt) {
 
 Lightbox.prototype.onDragOver = function(evt) {
        var target = getTargetedObject(evt);
-       if (!target) {return;}
-       while(target.className !== 'slide') {
+       while(target && target.className !== 'slide') {
                target = target.parentNode;
        }
+       if (!target) {return;}
        target = target.parentNode;
        if (target !== this.dragged) {
                target.classList.add('dragover');