Getting JS error when switch All day Event meta

[qutub-bharmal]

When I change All Day Event switch in event metabox it does not work first time and give below error:

Uncaught RangeError: Invalid time value
    at Date.toISOString (<anonymous>)
    at HTMLDivElement.<anonymous> (scripts.js?ver=2.7.19:99)
    at Function.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.7:2)
    at a.fn.init.each (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.7:2)
    at HTMLInputElement.<anonymous> (scripts.js?ver=2.7.19:79)
    at HTMLInputElement.dispatch (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.7:3)
    at HTMLInputElement.r.handle (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils,underscore,backbone,moxiejs,plupload&ver=4.9.7:3)

Latest WP, Plugin and fresh installation. no extra plugin or theme added.

File in Which it gives me error:
https://github.com/ThemeFuse/Unyson-Events-Extension/blob/master/includes/option-types/event/static/js/scripts.js#L99

Can you please check.

[qutub-bharmal]

Any Update Please ?