Introduction Page of the example "quit_installer" appears again after pressing the "Next" button

When I run the example "quit_installer" as part of QtIFW-1.5.0 and create an executable/binary and try to run it, the first page is the Introduction Page, Then when I click "Next" it asks me "Do you want to quit the installer?
This message box was created through javascript". I will choose "Yes", and here the binary is expected to go to the Finish Page, where it says "The Installer was aborted", but in reality it stays on the Introduction Page even after I choose the "Yes" button of the message box and it again allows me to choose the "Next" button of the Introduction Page.

In a nutshell, I will have to press the "Next" button of the Introduction twice to go to the Finish page.