Captcha result = null

Hello,

Thanks for the plugin ! It’s working fine on my custom form, sadly sometimes the result displayed is null. This seems to happen with a captcha of this format:

number operator box = null.
Example : 1 – box = null

It’s either an issue in the math or with the language of my wordpress (french). Maybe the result should be written in letters but can’t find a match in my language so it returns null. I will try with an english version of wordpress.

Thanks.
http://wordpress.org/extend/plugins/captcha/