• The product shows available stock in the admin but cannot be purchased
• The problem appears and disappears on its own after a few minutes
• In the Shopify admin, inventory shows "committed" units with no actual orders associated

1. Wait 15-20 minutes: reservations are automatically released
2. If the problem is recurrent, check if any third-party app is interfering with the reservation system
3. Manually adjust inventory from Products > Inventory if stock remains blocked
4. Consider activating the "Continue selling when out of stock" option for high-demand products

• The problem only occurs with certain variant combinations
• In the admin, some product variants show 0 units
• The purchase button is deactivated when certain options are selected

1. Go to Products > select the product > check the inventory of each variant individually
2. Update the stock of out-of-stock variants or mark them as unavailable
3. Configure your theme to visually show out-of-stock variants (crossed out or grayed out)
4. Activate the "Back in Stock" app to capture emails from customers interested in out-of-stock variants

• In the admin, the variant inventory shows 0 or a negative number
• The variant settings have "Track quantity" activated
• The "Continue selling when out of stock" option is deactivated

1. Go to Products > select the product > edit the variant
2. Update the number of available units to the actual stock
3. If the product never runs out of stock (digital, service, print-on-demand), disable inventory tracking
4. If you want to allow purchases even with 0 stock, activate "Continue selling when out of stock"

Conflict with third-party inventory apps

Inventory management apps, dropshipping (DSers, AutoDS) or ERP synchronization can overwrite Shopify's inventory with incorrect values or create conflicts in reservations. If the problem appeared after installing a new app, that's the first place to look.

Solution: Temporarily deactivate the suspicious app and check if the problem persists. Review the app's synchronization logs to identify conflicts. Contact the app's support with the specific error.

Product assigned to location with no stock

If you have multiple locations (warehouses, physical stores, 3PLs), Shopify assigns inventory by location. If the product has stock in one location but the location assigned for online fulfillment has 0 units, customers will not be able to purchase even if the total stock is positive.

Solution: Go to Products > Inventory and check stock by location. Make sure the location configured for online sales has the correct stock. Transfer inventory between locations if necessary.

Misconfigured inventory policy

Shopify has two inventory policies: "deny" (blocks purchase when stock reaches 0) and "continue" (allows purchase even if there is no stock). If you have "deny" activated and stock is at 0 due to a counting error, customers will not be able to purchase even if you physically have the product.

Solution: Review the inventory policy for each variant in the admin. Update the stock to the correct number or change the policy to "continue" if your operation allows it.

Sync error with external sales channel

If you sell on Shopify and also on Mercado Libre, Amazon, TikTok Shop or another channel, and you have active inventory synchronization, a sale on an external channel can reduce stock in Shopify without you immediately seeing it. The result: the product appears available on Shopify but the actual stock is already at 0.

Solution: Review the inventory adjustment history in Shopify to identify which channel or app reduced the stock. Set up a safety stock (buffer) to prevent overselling between channels.

Archived product or draft published by mistake

A product may appear in the store (because it is indexed on Google or via a saved link) but be in "Draft" or "Archived" status in Shopify. In that case, the customer can see the product page but cannot complete the purchase because the product is not active.

Solution: Go to Products in the admin and check the product's status (Active, Draft, Archived). If it is in Draft or Archived, change it to Active. Also, verify that it is published on the "Online Store" sales channel.

📋 Step 1: Check inventory by variant

Go to Products > select the product > check the stock of each variant individually. Look for variants with 0 units or with "committed" stock without real orders.

📋 Step 2: Review adjustment history

In Products > Inventory, you can view the stock change history. Identify which app, channel, or user modified the inventory and when.

📋 Step 3: Verify product status

Confirm that the product is "Active" and published on the "Online Store" channel. A product in Draft status can be viewed but not purchased.

📋 Step 4: Test checkout yourself

Go to your store in incognito mode, select the problematic product and variant, and try to reach checkout. Note exactly at which step it fails and what error message appears.

📊 Monthly Inventory Audit

Once a month, review the inventory of your best-selling products variant by variant. Detect discrepancies between physical stock and Shopify stock before they affect sales.

🔒 Safety Stock (buffer)

If you sell on multiple channels, set up safety stock in Shopify (e.g., stop online sales when 2 units remain) to prevent overselling across channels.

🔔 Low Stock Alerts

Set up automatic alerts when a product's stock reaches a minimum threshold. Shopify Flow can send email notifications when inventory drops below X units.

✅ Regular Checkout Testing

Once a week, go through the entire purchase journey on your store as a customer. It's the fastest way to detect problems before your customers encounter them.

The most common causes are: the selected variant has 0 units, the product is in Draft status, or there's a conflict with a third-party app. Check the specific variant's inventory and the product's status in the admin.

Yes. In each variant's settings, enable the "Continue selling when out of stock" option. This allows customers to purchase even if the counter reaches 0. Useful for digital products, services, or made-to-order items.

Go to Products > Inventory > select a variant > view adjustment history. Shopify records every inventory change with the source (app, user, channel). There you can identify what is modifying the stock.

Committed inventory is the stock reserved for orders that have already been created but have not yet been fulfilled (pending fulfillment). If you have many committed units without real orders, it may indicate a problem with checkout reservations or a third-party app.

Yes, if you have the option to continue selling out of stock enabled. Negative inventory indicates that you sold more units than you had recorded. It is a sign that you need to make an inventory adjustment and review your merchandise receiving process.