diff --git a/addons/mrp/models/stock_rule.py b/addons/mrp/models/stock_rule.py
index df9dae68342..ae8faf098ef 100644
--- a/addons/mrp/models/stock_rule.py
+++ b/addons/mrp/models/stock_rule.py
@@ -119,8 +119,8 @@ class StockRule(models.Model):
             'origin': origin,
             'product_id': product_id.id,
             'product_description_variants': values.get('product_description_variants'),
-            'product_qty': product_uom._compute_quantity(product_qty, bom.product_uom_id),
-            'product_uom_id': bom.product_uom_id.id,
+            'product_qty': product_uom._compute_quantity(product_qty, bom.product_uom_id) if bom else product_qty,
+            'product_uom_id': bom.product_uom_id.id if bom else product_uom.id,
             'location_src_id': self.location_src_id.id or self.picking_type_id.default_location_src_id.id or location_dest_id.id,
             'location_dest_id': location_dest_id.id,
             'bom_id': bom.id,