So lately I've been working on a Custom Data Provider for Sitecore and it's really neat and works pretty well until I encountered this:

![Double Languages](https://i.stack.imgur.com/JSwEd.png)

As you can see I'm receiving double language versions. Even though the GetItemVersions of my DataProvider looks like this:

```
/// <summary>
/// Used to retrieve version and language information of given item.
/// </summary>
public override VersionUriList GetItemVersions(ItemDefinition itemDefinition, CallContext context)
{
    VersionUriList result = null;

    if (itemDefinition.ID == RootItem.RootId)
    {
        // Our root only has 1 version in 1 language.
        result = new VersionUriList { new VersionUri(LanguageManager.GetLanguage("en"), Version.First) };
    }
    else if (CanProcess(itemDefinition.ID))
    {
        // Snipped processing of own items
    }

    return result;
}

```

So this means that any item that I don't handle I return `null`. Has anyone seen this behaviour before and knows exactly where to fix this?