diff --git a/mrp_subcontracting/models/purchase_order.py b/mrp_subcontracting/models/purchase_order.py
index a2fe4a00..f25c8752 100644
--- a/mrp_subcontracting/models/purchase_order.py
+++ b/mrp_subcontracting/models/purchase_order.py
@@ -25,6 +25,8 @@ def wkf_confirm_order(self):
                 if move.work_order.id == self.mrp_operation.id:
                     if not picking:
                         wc_line = self.mrp_operation.routing_wc_line
+                        if not wc_line.picking_type_id:
+                            continue
                         vals = {'origin': self.mrp_operation.name,
                                 'picking_type_id': wc_line.picking_type_id.id,
                                 'invoice_state': 'none',