Version-Release number of selected component:
cinnamon-3.2.2-1.fc25

Additional info:
reporter:       libreport-2.8.0
cmdline:        /usr/bin/python3 /usr/share/cinnamon/cinnamon-settings/xlet-settings.py desklet temperature@swalladge 3
executable:     /usr/share/cinnamon/cinnamon-settings/xlet-settings.py
kernel:         4.8.10-300.fc25.x86_64
pkg_fingerprint: 4089 D8F2 FDB1 9C98
pkg_vendor:     Fedora Project
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
Gio.py:171:__call__:GLib.GError: g-io-error-quark: GDBus.Error:org.gnome.gjs.JSError.Error: Argument 'msg' (type interface) may not be null (36)

Traceback (most recent call last):
  File "/usr/share/cinnamon/cinnamon-settings/bin/JsonSettingsWidgets.py", line 84, in object_value_changed
    self.set_value(key, value)
  File "/usr/share/cinnamon/cinnamon-settings/bin/JsonSettingsWidgets.py", line 64, in set_value
    self.notify_callback(self, key, value)
  File "/usr/share/cinnamon/cinnamon-settings/xlet-settings.py", line 302, in notify_dbus
    proxy.updateSetting('(ssss)', self.uuid, handler.instance_id, key, json.dumps(value))
  File "/usr/lib64/python3.5/site-packages/gi/overrides/Gio.py", line 171, in __call__
    None)
GLib.GError: g-io-error-quark: GDBus.Error:org.gnome.gjs.JSError.Error: Argument 'msg' (type interface) may not be null (36)

Local variables in innermost frame:
args: ('temperature@swalladge', 'temperature@swalladge', 'server', '"http:/:8888"')
signature: '(ssss)'
arg_variant: GLib.Variant('(ssss)', ('temperature@swalladge', 'temperature@swalladge', 'server', '"http:/:8888"'))
kwargs: {}
self: <gi.overrides.Gio._DBusProxyMethodCall object at 0x7f926896b940>