How can I check a value for null in jquery without getting an error?

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Javascript

I've got this code:

if (returneddata.daterangeparams.TimeUnitsFrom != null) {

...which throws this error (as seen in the Chrome Dev Tools console) when the value is, indeed, null:

Index:1031 Uncaught TypeError: Cannot read property 'TimeUnitsFrom' of null

So how can I check for null in a way that I can avoid the error?

Based on a suggestion here http://stackoverflow.com/questions/12271750/how-to-check-if-a-variable-is-both-null-and-or-undefined-in-javascript, I even tried this:

if (returneddata.daterangeparams.TimeUnitsFrom != null && variable !== undefined) {

...but I still get the same whinging from the guts of the browser.

Code in greater context:

function populatedaterangeprams(rptval, returneddata) {
                    var fromval = '';
                    var toval = '';
                    if (returneddata.daterangeparams.TimeUnitsFrom != null && 

returneddata.daterangeparams.TimeUnitsFrom !== undefined) {
                        fromval = returneddata.daterangeparams.TimeUnitsFrom;
                    }
                    if (returneddata.daterangeparams.TimeUnitsTo != null && 

returneddata.daterangeparams.TimeUnitsTo !== undefined) {
                        toval = returneddata.daterangeparams.TimeUnitsTo;
                    }

                    if (rptval === 1) {
                        // Produce Usage
                        $("#produsagefrom").val(fromval);
                        $("#produsageto").val(toval);
                    } else if (rptval === 2) {
			. . .

So how can I safely check for null?

What I have tried:

Based on a suggestion here http://stackoverflow.com/questions/12271750/how-to-check-if-a-variable-is-both-null-and-or-undefined-in-javascript, I even tried this:

if (returneddata.daterangeparams.TimeUnitsFrom != null && variable !== undefined) {

...but I still get the same whinging from the guts of the browser.