(zeitgeist-datahub:4077) syslog entries Ubuntu 16.04.1LTS

chris@localhost:~$ apt-cache policy zeitgeist-datahub
zeitgeist-datahub:
  Installed: 0.9.16-0ubuntu4
  Candidate: 0.9.16-0ubuntu4
  Version table:
 *** 0.9.16-0ubuntu4 500
        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

chris@localhost:~$ lsb_release -rd
Description: Ubuntu 16.04.1 LTS
Release: 16.04

I keep seeing entries in my syslog like this

Aug 23 11:09:53 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): CRITICAL **: string_strip: assertion 'self != NULL' failed
Aug 23 11:09:53 localhost gnome-session[3679]: (zeitgeist-datahub:4077): Gtk-CRITICAL **: gtk_recent_info_get_application_info: assertion 'app_name != NULL' failed
Aug 23 11:09:53 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): WARNING **: recent-manager-provider.vala:106: (null) was not registered in RecentInfo item 0xd93ab0
Aug 23 11:13:01 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): CRITICAL **: string_strip: assertion 'self != NULL' failed
Aug 23 11:13:01 localhost gnome-session[3679]: (zeitgeist-datahub:4077): Gtk-CRITICAL **: gtk_recent_info_get_application_info: assertion 'app_name != NULL' failed
Aug 23 11:13:01 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): WARNING **: recent-manager-provider.vala:106: (null) was not registered in RecentInfo item 0xd93990
Aug 23 11:13:23 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): CRITICAL **: string_strip: assertion 'self != NULL' failed
Aug 23 11:13:23 localhost gnome-session[3679]: (zeitgeist-datahub:4077): Gtk-CRITICAL **: gtk_recent_info_get_application_info: assertion 'app_name != NULL' failed
Aug 23 11:13:23 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): WARNING **: recent-manager-provider.vala:106: (null) was not registered in RecentInfo item 0xd939f0
Aug 23 11:13:34 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): CRITICAL **: string_strip: assertion 'self != NULL' failed
Aug 23 11:13:34 localhost gnome-session[3679]: (zeitgeist-datahub:4077): Gtk-CRITICAL **: gtk_recent_info_get_application_info: assertion 'app_name != NULL' failed
Aug 23 11:13:34 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): WARNING **: recent-manager-provider.vala:106: (null) was not registered in RecentInfo item 0xe0c890
Aug 23 11:14:18 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): CRITICAL **: string_strip: assertion 'self != NULL' failed
Aug 23 11:14:18 localhost gnome-session[3679]: (zeitgeist-datahub:4077): Gtk-CRITICAL **: gtk_recent_info_get_application_info: assertion 'app_name != NULL' failed
Aug 23 11:14:18 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): WARNING **: recent-manager-provider.vala:106: (null) was not registered in RecentInfo item 0xd92d60
Aug 23 11:17:01 localhost CRON[6080]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Aug 23 11:17:27 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): CRITICAL **: string_strip: assertion 'self != NULL' failed
Aug 23 11:17:27 localhost gnome-session[3679]: (zeitgeist-datahub:4077): Gtk-CRITICAL **: gtk_recent_info_get_application_info: assertion 'app_name != NULL' failed
Aug 23 11:17:27 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): WARNING **: recent-manager-provider.vala:106: (null) was not registered in RecentInfo item 0xd95cc0
Aug 23 11:17:28 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): CRITICAL **: string_strip: assertion 'self != NULL' failed
Aug 23 11:17:28 localhost gnome-session[3679]: (zeitgeist-datahub:4077): Gtk-CRITICAL **: gtk_recent_info_get_application_info: assertion 'app_name != NULL' failed
Aug 23 11:17:28 localhost gnome-session[3679]: ** (zeitgeist-datahub:4077): WARNING **: recent-manager-provider.vala:106: (null) was not registered in RecentInfo item 0xcc1190

I have no clue what they mean or if they're even anything to be concerned about. Possibly someone can enlighten me on this.