Unable to filter Timesheet entries

Hi,

In the All Timesheet page, you can choose to filter your entries by selecting a different status in the "View By" drop-down:

However, lately, this option keeps producing an error whenever the filter is changed to anything other than "All":

I believe the culprit appears in the resulting route (URL) when the change is made. You can see in the address bar that the filter_by parameter is changed to Status.Unbilled%2Cundefined. I assume the undefined has no business being there at all:

Let me know if/how I should supply more details on this issue.

Thanks