Forum OpenACS Q&A: Response to Can't read ad_sec_deferred_dml

It's looking to see if any deferred dml has been queued by ad_defer_dml.  This is all in tcl/ad-security.tcl and the queue's a global.  You can guard the check in the filter with a "[info exists ad_sec_deferred_dml]" but it's not clear why you should be seeing this problem suddenly when you haven't had it before.