Plugins Management Page errors #899

Hi, You have got a great product here and I'm testing it against an organisation's intranet on IIS. I've got the message below and wonder if it has come up before, I'm also uploading a backtrace. I did a search on the site and so far nothing has come up.
Notice: Undefined index: debugTrackVisitsInsidePiwikUI in C:\wamp\www\piwik\tmp\templates_c\%%1D^1D5^1D598A14%%piwik_tag.tpl.php on line 3

Attachment:
piwik_bug.txt

already fix in svn; thanks.