--- dwr-2.0.2/java/org/directwebremoting/dwrp/OutputAlarm.java  2007-10-11 11:09:28.000000000 +0300
+++ dwr-2.0.2-modified/java/org/directwebremoting/dwrp/OutputAlarm.java 2008-01-31 18:30:34.000000000 +0200
@@ -65,7 +65,9 @@
     public void cancel()
     {
         scriptSession.removeScriptConduit(conduit);
-        task.cancel();
+               if (task != null) {
+               task.cancel();
+               }
         super.cancel();
     }