Error "Customer Already Exists"

This error usually appears when your form is trying to create a new customer account in Shopify, but Shopify finds that the email (or phone) already belongs to an existing customer.

✅ Good news: nothing is broken! Shopify is just preventing duplicate customer accounts.

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🔍 Why this happens

When a form submits customer information (especially Email), Shopify checks if that customer is already in your store.

If the same email is already used by:

• an existing Shopify customer, or

• someone who already registered before,

then Shopify returns the message: “Customer already exists.”

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✅ How to solve

✅ If customer already exists: Choose Continue and update customer information

Steps

1. Open the app > click Forms > open the form you want to edit

2. Click the Integration icon on the left side > enable Shopify and click on Shopify option to open the setting

1. Find If customer already exists and select:

➡️ Continue and update customer information

1. Click save.

💡 Why we recommend this option

This helps you avoid the “Customer already exists” error when someone submits with an email that’s already in your Shopify Customers list.

Visit your storefront and test the form to ensure that existing customers can submit it without errors.

With this setting:

• If the email already exists, the form will not create a duplicate customer

• Instead, the app will update the existing customer’s information

• For example, if the email matches but the phone number is different, Shopify will keep the same customer and update the phone (and other mapped fields)

✅ Result: Customers can submit the form multiple times without errors, and their information stays up to date.