minor fix

production.py

@@ -542,17 +542,17 @@ class ProcessProductionAsync(Wizard):
         producibles = {}
 
         for line in lines:
-            product = line.product
+            product_id = line.product.id
             try:
-                producibles[product.id]['quantity'].append(line.quantity)
+                producibles[product_id]['quantity'].append(line.quantity)
             except:
                 outputs = BOMOutput.search([
-                    ('product', '=', product.id)
+                    ('product', '=', product_id)
                 ])
                 if not outputs:
                     continue
                 output = outputs[0]
-                producibles[product] = {
+                producibles[product_id] = {
                     'quantity': [line.quantity],
                     'bom': output.bom,
                 }