QEngine has the feature namely "Report Javascript Error in Reports", using which javascript arising in the web applications can be reported in the QEngine reports.

To configure to report the javascript errors follow the below instruction in QEngine,

Go to Settings page
Choose Exception Handling tab
Check the checkbox for "Report Javascript Error in Reports" and Apply the changes.

Now during playback if there is any javascript error arise, it will be notified in the reports.

Thanks & Regards,
Raghavan