diff --git a/addons/account/account_move_line.py b/addons/account/account_move_line.py
index 9012b930641..0b918d9874c 100644
--- a/addons/account/account_move_line.py
+++ b/addons/account/account_move_line.py
@@ -917,7 +917,7 @@ class account_move_line(osv.osv):
 
         if lines and lines[0]:
             partner_id = lines[0].partner_id and lines[0].partner_id.id or False
-            if not partner_obj.has_something_to_reconcile(cr, uid, partner_id, context=context):
+            if partner_id and not partner_obj.has_something_to_reconcile(cr, uid, partner_id, context=context):
                 partner_obj.mark_as_reconciled(cr, uid, [partner_id], context=context)
         return r_id