=== modified file 'bin/osv/orm.py'
--- bin/osv/orm.py	2010-05-18 13:57:53 +0000
+++ bin/osv/orm.py	2010-05-20 10:51:10 +0000
@@ -46,7 +46,7 @@
 import string
 import netsvc
 import re
-
+import osv
 import pickle
 
 import fields
@@ -559,7 +559,16 @@
                         r = self.pool.get(r._table_name).name_get(cr, uid, [r.id], context=context)
                         r = r and r[0] and r[0][1] or ''
                     data[fpos] = tools.ustr(r or '')
-        return [data] + lines
+                # Nasty hack 
+                # I did not have the time to strace the crazy code above
+                # so the basic tips consits to replace browse null with False type that
+                # can be marshalled by the GTK client
+                res = [data] + lines
+                for arr in res :
+                    for r in xrange(len(arr)):
+                        if type(arr[r]) == osv.orm.browse_null : #We do not use isinstance as it is a class
+                            arr[r] = False
+                return res
 
     def export_data(self, cr, uid, ids, fields_to_export, context=None):
         if not context: