When previewing graphs, sometimes the images fail to appear

[bmfmancini]

Hey Guys

I noticed that in 1.2.12 while in preview mode if you hit the back button you will sometimes see the following behavior

I see this in the error console of the browser

s/jquery.js?11c05eb286ed576526bf4543760785b9:3625:12) undefined
jQuery.Deferred.exceptionHook @ jquery.js?11c05eb286ed576526bf4543760785b9:3841
jquery.js?11c05eb286ed576526bf4543760785b9:3850 Uncaught TypeError: $(...).datetimepicker is not a function
at initPage (graph_view.php?nostate=true:549)
at HTMLDocument. (graph_view.php?nostate=true:571)
at mightThrow (jquery.js?11c05eb286ed576526bf4543760785b9:3557)
at process (jquery.js?11c05eb286ed576526bf4543760785b9:3625)

Browser is Chrome
Version 83.0.4103.106 (Official Build) (64-bit)

If you click on the Graphs tab or Tree view all goes back to normal
or if click the time view button then hit the back button