cron log question

Question for the gurus:

I'm seeing a recurring message in my cron.daily log report:
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/etc/cron.daily/logrotate:
error: apache:1 duplicate log entry for /var/log/httpd/access_log
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Does this mean there is a duplicate line in /var/log/httpd/access_log,
or that there is a duplicate entry in the logrotate script? It seems to
me that if it is a duplicate line in the access_log file, it should
go away when access_log gets rotated, unless apache is making
repeated duplicate entries. I've been seeing this for more than a
couple of weeks. Weird.

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Phil Mattison
Ohmikron Corp.
480-722-9595
602-820-9452 Mobile