First click on Calender Widget then after page show error

I use a calendar widget in a page . If i click calender tab through navigation then one error will be show :- " Could not create widget calendar.widget.calendar_dv: TypeError: Cannot read property 'length' of undefined " This error show only first click of calendar tab in navigation . If i click again calendar tab then i am not see any error . What can i do solve this error ? Thanks, Vipender Kumar
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