Datepicker: programmatically destroy don't work anymore

[differens]

After upgrading from version 1.12.1 to 1.13.2 the method datepicker( "destroy" ) do not close and destroy the calendar ui.

I have prepared an example at the link below.

https://jsfiddle.net/7kdwvgp8/

After starting the execution just open the calendar and wait for the timeout which calls the destroy after 5 seconds. The result is that the calendar remains open and each iteration leads to an error

Problem not occurs in 1.12.1.

Thank you in advance.