diff --git a/src/pages/app/checkout.tsx b/src/pages/app/checkout.tsx
index 54048b6..22420cd 100644
--- a/src/pages/app/checkout.tsx
+++ b/src/pages/app/checkout.tsx
@@ -224,7 +224,7 @@ const CheckoutPage = () => {
                     <Box
                       onClick={() =>
                         navigateToTransaction(
-                          transactionInitializeResult.data.transactionInitialize?.transaction?.id
+                          transactionInitializeResult.data?.transactionInitialize?.transaction?.id
                         )
                       }
                       cursor="pointer"
diff --git a/vercel.json b/vercel.json
new file mode 100644
index 0000000..96ff4ed
--- /dev/null
+++ b/vercel.json
@@ -0,0 +1,7 @@
+{
+  "functions": {
+    "src/pages/api/webhooks/saleor/**/*": {
+      "memory": 256
+    }
+  }
+}
\ No newline at end of file