/usr/bin/zeitgeist-daemon:6:____lambda5__glog_func:g_logv:g_log:zeitgeist_data_source_registry_extension_real_unload:g_ptr_array_foreach

The Ubuntu Error Tracker has been receiving reports about a problem regarding zeitgeist. This problem was most recently seen with package version 0.9.16-0ubuntu4, the problem page at https://errors.ubuntu.com/problem/574e1ecf533881654f7b16a660950f60d8e94efe contains more details, including versions of packages affected, stacktrace or traceback, and individual crash reports.
If you do not have access to the Ubuntu Error Tracker you can request it at http://forms.canonical.com/reports/.