diff -r 59d5596a9c6c -r ae352b763959 vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java
--- a/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Mon Feb 11 12:46:43 2013 +0100
+++ b/vm/src/test/java/org/apidesign/vm4brwsr/TestVM.java	Fri Feb 15 21:14:49 2013 +0100
@@ -58,7 +58,7 @@
         if (ret == null && expRes == null) {
             return null;
         }
-        if (expRes.equals(ret)) {
+        if (expRes != null && expRes.equals(ret)) {
             return null;
         }
         if (expRes instanceof Number) {