Description of problem:
No idea what exactly happened, I'm not even convinced that this is a bug. It was the first boot after a F27->rawhide upgrade. After I logged in to the LXDE environment, opened a terminal, entered 'su -', then 'dnf clean all ; dnf update'. The output was the following:

[root@pfed01 log]# dnf clean all ; dnf update
52 files removed
Waiting for process with pid 1757 to finish.
^CKeyboardInterrupt: Terminated.
[root@pfed01 log]# ^C
[root@pfed01 log]# ps -ef | grep 1757
root      1757     1 20 08:08 ?        00:00:14 /usr/bin/python3 /usr/share/dnfdaemon/dnfdaemon-system
root      1814  1768  0 08:09 pts/0    00:00:00 grep --color=auto 1757
[root@pfed01 log]# 

As you can see, I terminated it with ctrl+C after 3-5 seconds, then nearly the same time I checked what is 1757, the ABRT message popped up.

Version-Release number of selected component:
dnfdragora-gui-1.0.1-6.git20170505.2a3b056.fc27

Additional info:
reporter:       libreport-2.9.3
cmdline:        /usr/bin/python3 /bin/dnfdragora-updater
crash_function: _on_status_icon_popup_menu
exception_type: AttributeError
executable:     /bin/dnfdragora-updater
kernel:         4.15.0-0.rc1.git3.1.fc28.x86_64
runlevel:       N 5
type:           Python3
uid:            1000

Truncated backtrace:
_gtk.py:70:_on_status_icon_popup_menu:AttributeError: 'Icon' object has no attribute '_menu_handle'

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/pystray/_gtk.py", line 70, in _on_status_icon_popup_menu
    if self._menu_handle:
AttributeError: 'Icon' object has no attribute '_menu_handle'

Local variables in innermost frame:
activate_time: 170839
button: 3
status_icon: <Gtk.StatusIcon object at 0x7f01014c4318 (GtkStatusIcon at 0x556193c2b9c0)>
self: <pystray._gtk.Icon object at 0x7f01014b9f98>

Potential duplicate: bug 1476549