The last update was done in May this year, but I cannot recall any issues with the template. This does seem to be a Javascript error regarding loading the widget template. If you have an SLA, please contact Support and file a ticket (as this widget has Extended Support), I'll be sure to look into it. Otherwise, you could report an issue on Github.
As Mitchel says in the comment, I'd test upgrading the widget first and see if this solves the problem.