I got this error but everything works fine:

TypeError: Cannot read property "characterStyle" from undefined
at My Scripts/doeke/baselineShift1.js:17

is this a scriptographer bug?

here's the script:

//
var selectedTextItem = document.getItems({
	type: TextItem,
	selected: true
});
	
if (selectedTextItem.length > 0) {
	var item = selectedTextItem[0];
	//item.remove();
	var xChars = item.range.characters.length;
	print("xCharacters "+xChars);
	
	var yShift = 0;
	var step = 0.03
	var dir = 1;
	
	for (var i = 0; i <= xChars; i++){
		item.range.characters[i].characterStyle.baselineShift = yShift;
		
		yShift +=step*dir;
		if (yShift >= 1 || yShift <= 0){
			dir = -dir;;
		}
	}
	
} else {
	Dialog.alert('Please select a textItem first!');
}
//