diff --git a/addons/stock/wizard/stock_backorder_confirmation.py b/addons/stock/wizard/stock_backorder_confirmation.py
index 755ac27256b0b6cea5fb01bef5473077dbef9e65..060b8acf8cb7e42312769b9313786b2905543230 100644
--- a/addons/stock/wizard/stock_backorder_confirmation.py
+++ b/addons/stock/wizard/stock_backorder_confirmation.py
@@ -45,7 +45,8 @@ class StockBackorderConfirmation(models.TransientModel):
                                  move.quantity_done,
                                  precision_rounding=move.product_uom.rounding) > 0:
                     moves_to_log[move] = (move.quantity_done, move.product_uom_qty)
-            pick_id._log_less_quantities_than_expected(moves_to_log)
+            if moves_to_log:
+                pick_id._log_less_quantities_than_expected(moves_to_log)
 
     def process(self):
         pickings_to_do = self.env['stock.picking']