[Plugin: WP-Minify] error log message

Hello and thanks for making a great plugin. It appears that line 487:

error_log($latest_modified_string);

causes the following PHP warning to appear in the error log on every request:

[warn] mod_fcgid: stderr: &m=1315476339

Commenting out that line seems to resolve the problem. I assume this line exists for debugging purposes, Please have a look at it.

Thanks in advance.