Version-Release number of selected component:
setroubleshoot-server-3.3.12-3.fc27

Additional info:
reporter:       libreport-2.9.2
cmdline:        /usr/bin/python3 -Es /usr/sbin/setroubleshootd -f ''
crash_function: sighandler
exception_type: SystemExit
executable:     /usr/sbin/setroubleshootd
kernel:         4.13.0-1.fc27.x86_64
runlevel:       N 5
type:           Python3
uid:            991

Truncated backtrace:
service.py:647:_message_cb:SystemError: <built-in function isinstance> returned a result with an error set

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/dbus/connection.py", line 521, in _signal_func
    def _signal_func(self, message):
  File "/usr/lib/python3.6/site-packages/setroubleshoot/server.py", line 114, in sighandler
    sys.exit()
SystemExit

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/lib64/python3.6/site-packages/dbus/service.py", line 647, in _message_cb
    if not isinstance(message, MethodCallMessage):
SystemError: <built-in function isinstance> returned a result with an error set

Local variables in innermost frame:
self: <setroubleshoot.server.SetroubleshootdDBusObject at /org/fedoraproject/Setroubleshootd at 0x7f22e8e0cef0>
message: <dbus.lowlevel.MethodCallMessage path: /org/fedoraproject/Setroubleshootd, iface: org.fedoraproject.SetroubleshootdIface, member: avc dest: org.fedoraproject.Setroubleshootd>
connection: <dbus._dbus.SystemBus (system) at 0x7f22e11a26d0>

Potential duplicate: bug 1429711