Blazor NavigationManager throws Unspecified navigation exeption.

<EditForm 
    Model="server" 
    FormName="@($"form-server-{server.ServerId}")" 
    OnValidSubmit="@(() => {DeleteServer(server.ServerId);})">
    <button type="submit" class="btn btn-primary">Delete</button>
</EditForm>

private void DeleteServer(int serverId)
{
    if (serverId > 0)
    {
        ServerRepository.DeleteServer(serverId);
        NavigationManager.Refresh();
    }
}