diff --git a/addons/pad/pad.py b/addons/pad/pad.py
index 286c80d203a..86d0b550aec 100644
--- a/addons/pad/pad.py
+++ b/addons/pad/pad.py
@@ -113,7 +113,7 @@ class pad_common(osv.osv_memory):
     # Set the pad content in vals
     def _set_pad_value(self, cr, uid, vals, context=None):
         for k,v in vals.items():
-            field = self._fields[k]
+            field = self._fields.get(k)
             if hasattr(field,'pad_content_field'):
                 vals[field.pad_content_field] = self.pad_get_content(cr, uid, v, context=context)