diff --git a/flask/src/main.py b/flask/src/main.py
index 623fd4269..4ca9e8084 100644
--- a/flask/src/main.py
+++ b/flask/src/main.py
@@ -257,10 +257,9 @@ def checkout():
     try:
         if validate_inventory:
             with sentry_sdk.start_span(op="process_order", description="function"):
+                quantities = {int(k): v for k, v in cart['quantities'].items()}
                 if len(quantities) == 0:
                     raise Exception("Invalid checkout request: cart is empty")
-
-                quantities = {int(k): v for k, v in cart['quantities'].items()}
                 inventory_dict = {x.productid: x for x in inventory}
                 for product_id in quantities:
                     inventory_count = inventory_dict[product_id].count if product_id in inventory_dict else 0