I suggest, in the public_html .htaccess, you add
Code:
<FilesMatch "errorlog|error_log$">
 Order Allow,Deny
 Deny from all
</FilesMatch>
The .htaccess snipit, if put in your main public_html .htacces file, will "protect" all the errorlog or error_log files on your site. They tend to show up in strange places from time to time.

Smoge