# "Invalid suffix field!" when trying to create a contact handle

## Symptoms

When trying to register a domain or when creating a domain handle, the following error is being thrown:

```
<span>Invalid suffix field!</span>
```

## Cause

<span>*"Address line 2"* of WHMCS contact information tends to be mapped to the *"Suffix"* field of the [createCustomerRequest](https://doc.openprovider.eu/API_Module_Customer_createCustomerRequest) API call.</span>  
<span>Openprovider API validates the suffix field and does not allow the comma character (,) in it.</span>

## Resolution

This is a software issue of older versions of the WHMCS Registrar module. Please update to the new version available [here](https://github.com/openprovider/Openprovider-WHMCS-domains/releases/latest).

<span>Please suggest customer simplifying his Address Line 2 field, without the comma ",".</span>