I built a js script to add cart on theme, but once I added cart, app is broken to work. This code in template section of liquid. await fetch(window.Shopify.routes.root + 'cart/add.js', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify(formData) }) .then(response => { return response.json(); }) .catch((error) => { console.error('Error:', error); return false; }); Adding cart feature is working well, but once it has been done, Shopify site is broken and when I checked on windows task manager, memory consumpsion is increasing more and more with time. If anyone experienced in such issue, please leave comments. Thank you very much.