diff --git a/openerp/osv/orm.py b/openerp/osv/orm.py
index 65fcd68c7c3..ea52c6cc7a0 100644
--- a/openerp/osv/orm.py
+++ b/openerp/osv/orm.py
@@ -5217,7 +5217,7 @@ def convert_pgerror_23502(model, fields, info, e):
     m = re.match(r'^null value in column "(?P<field>\w+)" violates '
                  r'not-null constraint\n',
                  str(e))
-    field_name = m.group('field')
+    field_name = m and m.group('field')
     if not m or field_name not in fields:
         return {'message': unicode(e)}
     message = _(u"Missing required value for the field '%s'.") % field_name
@@ -5232,7 +5232,7 @@ def convert_pgerror_23502(model, fields, info, e):
 def convert_pgerror_23505(model, fields, info, e):
     m = re.match(r'^duplicate key (?P<field>\w+) violates unique constraint',
                  str(e))
-    field_name = m.group('field')
+    field_name = m and m.group('field')
     if not m or field_name not in fields:
         return {'message': unicode(e)}
     message = _(u"The value for the field '%s' already exists.") % field_name