Index: C:/eclipse3.2/eclipse/workspace/jython23/src/org/python/modules/_weakref.java
===================================================================
--- C:/eclipse3.2/eclipse/workspace/jython23/src/org/python/modules/_weakref.java	(revision 3008)
+++ C:/eclipse3.2/eclipse/workspace/jython23/src/org/python/modules/_weakref.java	(working copy)
@@ -121,16 +121,26 @@
     public static class GlobalRef extends WeakReference {
         private Vector references = new Vector();
         private int hash;
+        private boolean hasheable = false;
 
         public GlobalRef(PyObject object) {
             super(object);
-            hash = object.hashCode();
+            saveHash(object);
         }
 
+
         public GlobalRef(PyObject object, ReferenceQueue queue) {
             super(object, queue);
-            hash = object.hashCode();
+            saveHash(object);
         }
+        private void saveHash(PyObject object) {
+            try {
+                hash = object.hashCode();
+                hasheable = true;
+            } catch (Exception e) {
+                hasheable = false; 
+            }
+        }
 
         public synchronized void add(AbstractReference ref) {
             Reference r = new WeakReference(ref);
@@ -210,7 +220,13 @@
          * Allow GlobalRef's to be used as hashtable keys.
          */
         public int hashCode() {
-            return hash;
+            if (hasheable) {
+                return hash;
+            } else {
+                return 0; //XXX: What else can we do? 
+                          //GlobalRef objects are stored on hashtable so we 
+                          //can't raise an exception here.
+            }
         }
     }