How to avoid prompt for password if public key was rejected

My script looks like this:

option batch on
option batch abort
option confirm off
option echo off
open ABC
put -nopermissions -nopreservetime *.txt /ABC/
close
exit

But when my public key is rejected (for whatever reason) apparently I get prompted for password:
Here is part of the log:

2011-08-22 03:07:46.724 Reading private key file "D:\Program Files\PrivateKey..ppk"
! 2011-08-22 03:07:46.724 Using username "id".
. 2011-08-22 03:07:48.739 Offered public key
! 2011-08-22 03:07:49.177 Server refused our key
. 2011-08-22 03:07:49.177 Server refused public key
. 2011-08-22 03:07:49.177 Prompt (6, SSH password, , &Password: )

How can I prevent this from happening and error out immediately?

Is this a stupid question or nobody knows the answer?
It's OK to say it is stupid and why.
Thanks

The prompt should timeout in 10 seconds. What version of WinSCP are you using?

We are using version 4.2.7

So, is not supported in 4.2.7 and can not be configured?

No, please make sure you are using the latest stable version.