Hello TallonGS,

The code you're talking about is in the Filtering feature so reproducing it with Sorting API is odd. Can you please share your igGrid configuration so I can try to reproduce it on my end.

Thanks in advance,
Martin Pavlov

Infragistics, Inc.

I turns out that my demo file was not entirely representative of the original error. We are actually on JqueryUi version 1.12.0 and still get the "Cannot read property 'column' of null" error. I'll leave the first answer because it is probably useful to people that forgot to upgrade their jquery version.

I haven't been able to reproduce this issue in the isolated demo file yet, only in our application which uses a lot of features and also has some custom code to save and load igGrid settings from localstorage.
Here is the full stacktrace

VM11890 infragistics.lob.js:231 Uncaught TypeError: Cannot read property 'column' of null
    at $.(anonymous function).(anonymous function)._dataBound (http://localhost:14698/Scripts/Infragistics/js/infragistics.lob.js:231:27249)
    at $.(anonymous function).(anonymous function)._dataBound (http://localhost:14698/Scripts/jQuery/jquery-ui-1.12.1.js:144:25)
    at HTMLTableElement.proxy (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:496:14)
    at HTMLTableElement.dispatch (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:5206:27)
    at HTMLTableElement.elemData.handle (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:5014:28)
    at Object.trigger (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:8201:12)
    at HTMLTableElement.<anonymous> (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:8269:17)
    at Function.each (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:362:19)
    at jQuery.fn.init.each (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:157:17)
    at jQuery.fn.init.trigger (http://localhost:14698/Scripts/jQuery/jquery-3.2.1.js:8268:15)

It seems to happen when we call igGridSorting('sortColumn') in the igGridRendered event to restore the sorting settings from localstorage.
This error happens on this line of infragistics.lob.js

ditor._setOption("displayTimeOffset", this.grid._calcOffsetForCol(null, this.grid.getColumnByTD(editor.element.closest("td")).column))

editor.element.closest("td") does find an element but the getColumnByTD of it returns null. So I'm guessing that when the date column is hidden it still tries to set the timeOffset and fails? 
If I find out more or succeed in reproducing the issue in an isolated demo I will post an update.

Thanks for your reply. That was indeed the problem.
Is there any place you list the required versions of jQuery and jQuery UI? I can't seem to find it in the documentation.