I could reproduce the error in a connection with a redirect. Surprisingly, the error seems to make no harm. The problem seems to be that the request processor sets the package id after the redirect branch, therefore the package id cannot be obtained from ad_conn. The new version of the request monitor queries additionally whether ad_conn package_id returns a non-empty result before calling dotlrn_community::get_community_id.
http://media.wu-wien.ac.at/download/xowiki-doc/xotcl-apm.html
