Is there a simple way to determine whether an image is outside or inside the textFrame?

I feel so complicated now.

   var d = app.activeDocument;
var item = d.selection[0]; 

 if (item.constructor.name == 'Rectangle' && 'TextFrame' == item.parent.parentTextFrames[0].constructor.name) {

        var curFrame = item.parent.parentTextFrames[0];
        alert(curFrame);
        imgFitFrame(item, curFrame);
    }

I feel so complicated now.
When selecting an image, I want to get the text box where the image is located. But it's strange that when I select an image outside the box, there will be an error, and it should not have any response at this time.

At this point, 'item. parent. parentTextFrames [0]' does not exist and prompts' illegal '. What should I do?