SaveOptions.DONOTSAVECHANGES doesn't work sometimes

Hi, there is a part of my script which saves automatically color/black and white version of the file, then resized it to social media size and then adds aolumns for a square for Instagram. It ends by command

app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

but sometimes the document stays opened and I have to press ctrl-w to closing it and agree closing without saving. Any idea how to prevent this?

Thnaks

{
/// ... a some layer operations are here....
turnBWLayer(true);
SaveJPG(filePath + "/big", fileName + ".jpg");
ResizeLonger(2044);

SaveJPG(filePath + "/small", fileName + "c.jpg");
turnBWLayer(true);
SaveJPG(filePath + "/small", fileName + ".jpg");

Unlock(filePath);
app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);
}

function turnBWLayer(onoff) {
    if (app.activeDocument.layers.length > 0)
    { 
        for (var i = 0; i < app.activeDocument.layers.length; i++) {
            var currentLayer = app.activeDocument.layers[i];
            if (currentLayer.name == "BW") {
                currentLayer.visible = onoff;
                return true;
            }
        }
    }
	return false;
}

// this is because another script detects an operation in progress and waits for finishing

function Lock(folder) {
var _lock = new File(folder + "/lock.txt");
_lock.open("w");
_lock.writeln(".");
_lock.close();
}

function Unlock(folder) {
var _lock = new File(folder + "/lock.txt");
_lock.remove();
}

function SaveJPG(folder, fileName)
{
jpgFile = new File(folder + "/" + fileName);
jpgSaveOptions = new JPEGSaveOptions();
jpgSaveOptions.embedColorProfile = true;
jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;
jpgSaveOptions.matte = MatteType.NONE;
jpgSaveOptions.quality = 12;
app.activeDocument.saveAs(jpgFile, jpgSaveOptions, true,Extension.LOWERCASE);
}