In message <1377219882.0.0.610236726331.issue2550818@psf.upfronthosting.co.za> 
<1377219882.0.0.610236726331.issue2550818@psf.upfronthosting.co.za>,
Stuart Gathman writes:
>Version 1.4.20, running for over a year using sqlite database.  (2 or 3
>users)  No errors logged in roundup.log or /var/log/messages. "sqlite3
>db pragma integrity_check" finds no errors. The email to the admin says:
>    if not self.check(db, userid, itemid):
>  File "/var/lib/roundup/schema.py", line 103, in customer_issue
>    issue_topics = db.issue.get(itemid, 'topic')
>  File
>"/usr/lib/python2.6/site-packages/roundup/backends/rdbms_common.py",
>line 1672, in get
>    prop = self.properties[propname]
>KeyError: 'topic'

What does the schema.py in the tracker home directory look like?
Does the issue actually have a topic field?

There should be a line like:

                      topic=Multilink("topic"),

in the definition of the 'issue' issue class.