diff -r 942deef87200 -r 769b77cdb7a5 dew/src/main/java/org/apidesign/bck2brwsr/dew/Dew.java
--- a/dew/src/main/java/org/apidesign/bck2brwsr/dew/Dew.java	Fri Jan 25 10:25:30 2013 +0100
+++ b/dew/src/main/java/org/apidesign/bck2brwsr/dew/Dew.java	Mon Feb 11 19:51:35 2013 +0100
@@ -96,7 +96,9 @@
         }
         if (r.equals("/result.html")) {
             response.setContentType("text/html");
-            response.getOutputBuffer().write(data.getHtml());
+            if (data != null) {
+                response.getOutputBuffer().write(data.getHtml());
+            }
             response.setStatus(HttpStatus.OK_200);
             return;
         }