Disable default Notifier of Location Sensor

I am using location sensor. When user input City, State or Pin-code in textbox. It returns Latitude from Address and Longitude from Address. But if user input invalid City name, that does not return Latitude and Longitude. Then my app shows error like " Error101: Unable to find latitude from ‘CITY NAME’ " by default. I haven’t used any notifier. I want to disable this default notifier and show my custom error for invalid input CITY name.

Try the OnErrorOccured event, but it’s broken. 3 months have passed, no response other than the “needs confirmation” tag.