1. I used my self account to login: xiqin
2. created a no SPEC URL cert whose status is preproduction: https://bz-web1-test.devel.redhat.com/show_bug.cgi?id=667822
3. click "Edit Hardware" to make hardware for it;
4. added cpu and memory into feature list;
5. save change failed because no sepc URL can be selected; and I see a error page:
<snip>
 Bad argument param sent to Bugzilla::Extension::Hwcert::ModelName::new function. 
</snip>
<snip>
undef error - ModPerl::Util::exit: (120000) exit was called at /var/www/html/bugzilla/Bugzilla/Error.pm line 139
</snip>
6. go back to "https://bz-web1-test.devel.redhat.com/show_bug.cgi?id=667822", try to click the "edit hardware", see error page again. 

https://bugzilla.redhat.com/show_bug.cgi?id=677206 meet the same error. it can be duplicated with above steps.