Error from Activity Log stream enumeration in log.nsf

I’ve been getting the following errors lately:

28-11-2003 03:23:32 AT Collector: Activity Trends Collector started

28-11-2003 03:23:35 AT Collector: Initialization of Activity Trends Store is Complete

28-11-2003 03:23:36 AT Collector: Processing observation for 19-11-2003

28-11-2003 03:23:36 AT Collector: Reading database properties from the catalog, catalog.nsf

28-11-2003 03:23:36 AT Collector: 220 databases read from catalog, catalog.nsf

28-11-2003 03:23:36 AT Collector: Processing activity log data from log.nsf

28-11-2003 03:23:37 AT Collector: Error from Activity Log stream enumeration in log.nsf - Invalid activity type. See Notes API reference for details.

28-11-2003 03:23:37 AT Collector: 0 activity data items inspected, 0 items ignored, 0 invalid items from log.nsf

28-11-2003 03:23:38 AT Collector: Completed processing of 0 observation(s)

28-11-2003 03:23:38 AT Collector: Activity Trends Collector stopped

This server has been upgraded from R6.0.2 CF2 to R6.5.

Has anyone else seen this and (what’s more important) knows how to get rid of those?

TIA

IRC: Woonjas in EFNet’s notes