diff --git a/product.py b/product.py
index 9fd2649abb..409a7dcee5 100644
--- a/product.py
+++ b/product.py
@@ -543,7 +543,6 @@ class ProductQuantitiesByWarehouse(ModelSQL, ModelView):
                 'stock_date_end': date,
                 'forecast': True,
                 }
-            assert date != date_start
             with Transaction().set_context(**context):
                 quantities[date] = Product.products_by_location(
                     [warehouse_id],