exception handler doesn't seem to work

[akobig]

I created the unhandled_exceptions function exactly as in the manual, and configured the zappa_settings.json.

this is the function:
def unhandled_exceptions(e, event, context):
send_email(to=[developer_email], subject="unhandled exception in app", text="test")
print("exception test")
return True

I don't get any email (this function 100% working) when there is an exception nor seeing the print output in log.
the exception is clearly printed in the log, as usual.

I really want this to work since it is the only easy way to send the exception in email.
tnx