Internal Server Error when listing content-view filter rules via hammer

Issue

• Internal Server Error when listing content-view filter rules via hammer
• Upon listing content view filter rules via hammer, it gives Internal Server Error:-

hammer> content-view filter rule list --content-view-filter-id 

[ INFO 2015-08-24 14:43:02 HammerCLI::ShellMainCommand] Called with options: {}
[DEBUG 2015-08-24 14:43:02 Connection] Registered: foreman
[DEBUG 2015-08-24 14:43:02 API] Global headers: {
        :content_type => "application/json",
              :accept => "application/json;version=2",
    "Accept-Language" => "en"
}
[ INFO 2015-08-24 14:43:03 HammerCLIKatello::ContentView] Called with options: {}
[ INFO 2015-08-24 14:43:03 HammerCLIKatello::Filter] Called with options: {}
[ INFO 2015-08-24 14:43:03 HammerCLIKatello::FilterRule] Called with options: {}
[ INFO 2015-08-24 14:43:03 HammerCLIKatello::FilterRule::ListCommand] Called with options: {"option_content_view_filter_id"=>"4"}
[ INFO 2015-08-24 14:43:03 API] GET /katello/api/content_view_filters/4/rules
[DEBUG 2015-08-24 14:43:03 API] Params: {}
[DEBUG 2015-08-24 14:43:03 API] Headers: {
    :params => {}
}
[DEBUG 2015-08-24 14:43:04 API] 500 Internal Server Error
{
    "displayMessage" => "Unable to order by column 'name_sort'.",
            "errors" => [
        [0] "Unable to order by column 'name_sort'."
    ]
}
[ERROR 2015-08-24 14:43:04 Exception] Unable to order by column 'name_sort'.
Unable to order by column 'name_sort'.
[ERROR 2015-08-24 14:43:04 Exception]