Increase in Abandoned Checkouts Due to Out-of-Stock Items in Carts – Requesting Guidance

Shopify Discussion
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Topic summary

A merchant is experiencing increased abandoned checkouts because customers can add out-of-stock items to their carts, seeking to understand the root cause.

Common causes identified:

  • Inventory sync delays from third-party apps (dropshipping, fulfillment services) not updating stock in real-time
  • External sales channels like Shopify Buy Buttons failing to reflect current inventory
  • Theme customizations or app conflicts bypassing Shopify’s stock validation logic
  • “Continue selling when out of stock” setting accidentally enabled on products
  • Multiple location inventory pulling from warehouses with zero stock

Recommended solutions:

  • Verify inventory sync settings with connected apps and ensure API intervals are optimized
  • Disable “Continue selling when out of stock” across all products/variants
  • Review theme code to ensure Add to Cart buttons properly disable for unavailable items
  • Audit inventory settings across all fulfillment locations
  • Consider preventative tools like Shopify Flow for automated alerts or cart validation scripts

The discussion remains open for the original poster to implement these troubleshooting steps.

Summarized with AI on October 28. AI used: claude-sonnet-4-5-20250929.
1

Hi Team,

Has anyone else noticed an increase in abandoned checkouts due to customers being able to add out-of-stock products to their carts? We’re not sure how this is happening and would appreciate any insights or guidance.

1 Like
2

Hello @indra Yes, this is a fairly common issue in Shopify stores—customers sometimes manage to add out-of-stock products to their cart due to several possible causes. Here’s how it can happen and what to check or do:

Possible Causes & Fixes

  1. Oversold Inventory Due to App Sync Lag
    If you’re using inventory or dropshipping apps (like Oberlo, Printful, etc.), they might not update stock levels in real-time.

Fix:

. Double-check that inventory syncing is enabled and timely.

. Reach out to app support to ensure API sync intervals are optimal.

  1. Buy Button / External Sales Channels
    Sometimes Shopify Buy Buttons (embedded on external sites) don’t reflect live inventory.

Fix:

. Make sure “Continue selling when out of stock” is disabled for all products.

. Remove or update any outdated Buy Buttons.

  1. Theme Customization or App Conflicts
    A customized theme or an app may bypass Shopify’s stock validation.

Fix:

. Review your theme’s product/variant selection logic to ensure it disables or hides the “Add to Cart” button for out-of-stock variants.

. Test in incognito mode or on a fresh theme to compare.

  1. Pre-orders or Backorders Accidentally Enabled
    If “Continue selling when out of stock” is on for any products, customers can still purchase them even if stock is zero.

Fix:

. Go to Products > Edit each product/variant and uncheck this option.

. Use bulk editor if you have many SKUs.

  1. Inventory Managed by Multiple Locations
    If you have multiple locations set up (like store and warehouse), the cart might pull from a location with no inventory.

Fix:

. Go to Settings > Locations and check inventory settings per location.

. Make sure all locations reflect accurate stock and fulfillment priorities.

Preventative Tools
. Shopify Flow (for Plus stores): Automate alerts when stock hits 0.

. Shopify Scripts / Custom Cart Validation: Prevent checkout if cart contains OOS items.

. Inventory Management Apps: Try apps like Stocky, Skubana, or Sellbrite for better inventory accuracy.

Thank you :blush: