diff --git a/addons/mrp_repair/mrp_repair.py b/addons/mrp_repair/mrp_repair.py
index e1216332ae4..2edaba9431a 100644
--- a/addons/mrp_repair/mrp_repair.py
+++ b/addons/mrp_repair/mrp_repair.py
@@ -330,6 +330,8 @@ class mrp_repair(osv.osv):
                 self.write(cr, uid, [o.id], {'state': '2binvoiced'})
             else:
                 self.write(cr, uid, [o.id], {'state': 'confirmed'})
+                if not o.operations:
+                    raise osv.except_osv(_('Error !'),_('You cannot confirm a repair order which has no line.'))
                 for line in o.operations:
                     if line.product_id.track_production and not line.prodlot_id:
                         raise osv.except_osv(_('Warning'), _("Production lot is required for opration line with product '%s'") % (line.product_id.name))