Why it gives error in response

[anupal_patra]

2023-05-23 08:05:55 │ backend │ const session = res.locals.shopify.session;
2023-05-23 08:05:55 │ backend │ ^
2023-05-23 08:05:55 │ backend │
2023-05-23 08:05:55 │ backend │ TypeError: Cannot read properties of undefined (reading ‘shopify’)