Uncaught RangeError: Maximum call stack size exceeded

[Ngorror]

I'm using ExtJS 4.2.2 When I click browse button, select a files and click OK I received next error:

Uncaught RangeError: Maximum call stack size exceeded

I saw endless firing of event 'fileselected' in BrowseButton.js row 47

this.fireEvent('fileselected', this, files);

I changed it to

                if (files.length != 0) {
                    this.fireEvent('fileselected', this, files);
                }

and example works

[ivan-novakov]

What browser and what OS do you use?

[Ngorror]

chrome Version 31.0.1650.57 m firefox 25.0.1 windows 7 pro