Index: C:/workspace/jython_svn/jython/src/org/python/core/PySystemState.java
===================================================================
--- C:/workspace/jython_svn/jython/src/org/python/core/PySystemState.java	(revision 3353)
+++ C:/workspace/jython_svn/jython/src/org/python/core/PySystemState.java	(working copy)
@@ -801,10 +801,10 @@
     // a reflected function is inserted in the class dict.
 
     static void displayhook(PyObject o) {
-        /* Print value except if None */
+        /* Print value except if null or None */
         /* After printing, also assign to '_' */
         /* Before, set '_' to None to avoid recursion */
-        if (o == Py.None)
+        if (o == null || o == Py.None)
              return;
 
         PySystemState sys = Py.getThreadState().systemState;