/usr/libexec/xdg-desktop-portal:11:g_variant_is_trusted:g_variant_builder_add_value:g_variant_builder_add_value:g_variant_valist_new:g_variant_new_va

The Ubuntu Error Tracker has been receiving reports about a problem regarding xdg-desktop-portal. This problem was most recently seen with package version 1.18.0-1ubuntu1, the problem page at https://errors.ubuntu.com/problem/78eb30e57344fdb71b31b6d7d932865ab3d31c33 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 and are a software developer, you can request it at http://forms.canonical.com/reports/.