fixes #4563, added null check to detect if drag went out of content area.

svn changeset:12983/svn branch:6.3

diff --git a/src/com/vaadin/terminal/gwt/client/Util.java b/src/com/vaadin/terminal/gwt/client/Util.java
index 4b56ae7a4412414a1fd1b3cc90c36821084cf914..13cb3b0955d54f60a64a48169d7abc056a6099a7 100644 (file)
--- a/src/com/vaadin/terminal/gwt/client/Util.java
+++ b/src/com/vaadin/terminal/gwt/client/Util.java
@@ -53,7 +53,7 @@ public class Util {
     public static native Element getElementFromPoint(int clientX, int clientY)
     /*-{
         var el = $wnd.document.elementFromPoint(clientX, clientY);
-        if(el.nodeType == 3) {
+        if(el != null && el.nodeType == 3) {
             el = el.parentNode;
         }
         return el;