/usr/lib/gvfs/gvfsd-metadata:6:g_assertion_message:g_assertion_message_expr:meta_journal_add_entry:meta_tree_set_string:handle_set

[errors.ubuntu.com bug bridge]

The Ubuntu Error Tracker has been receiving reports about a problem regarding gvfs. This problem was most recently seen with package version 1.28.2-1ubuntu2, the problem page at https://errors.ubuntu.com/problem/cd55686c58c9510c789ec988cba9e34d732b4128 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/.