http-form-brute: uservar bug

[Josh Greenwood <joshgreenwood () gmail com>]

If I'm reading the documentation correctly, the following scan should work:
./nmap --script http-form-brute --script-args
http-form-brute.uservar=username 192.168.0.1

Yet I get the following error:
PORT   STATE SERVICE
80/tcp open  http
| http-form-brute:
|_  ERROR: No uservar was specified (see http-form-brute.uservar)

Am I providing the uservar value incorrectly, or is this a bug?  I'm using
nmap 5.51SVN, revision 23136.

Please let me know if I can provide additional information.

Thanks,
Josh
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