"Fields" argument causes error

When retrieving nodes with a "fields" argument, the services_resource_build_index_query function in services.module throws an error as it attempts to split the fields string into an array after already having done it.

Line 470:
$fields = explode(',', $fields); // This splits the $fields string into an array
$query->fields('t', $explode(',', $fields)); // This line errors as we attempt to split the fields array again