[flow@flow-pc ~]$ doublecmd %F
Starting GuiMessageQueue
Starting Double Commander
Double Commander 0.8.3 beta
Revision: 8160
Build: 2018/06/04
Lazarus: 1.8.2.0
Free Pascal: 3.0.4
Platform: x86_64-Linux-qt5
System: Manjaro Linux
Desktop Environment: KDE
Widgetset library: Qt 5.11.0, libQt5Pas 5.6.1
This program is free software released under terms of GNU GPL 2
(C)opyright 2006-2017 Alexander Koblov (alexx2000@mail.ru)
   and contributors (see about dialog)
Executable directory: /usr/lib/doublecmd/
Loading configuration from /home/flow/.config/doublecmd/
WDX: LOAD: /usr/lib/doublecmd/plugins/wdx/deb_wdx/deb_wdx.wdx
WDX: LOAD: /usr/lib/doublecmd/plugins/wdx/rpm_wdx/rpm_wdx.wdx
WDX: LOAD: /usr/lib/doublecmd/plugins/wdx/audioinfo/audioinfo.wdx
PollThread: Start polling
PollThread: AddPoll 13
Creating PixmapManager
Loading icon theme Breath
Loading icon theme Hicolor
Theme default.kde4 not found.
Loading icon theme DCTheme
Loading icon theme DCTheme
PollThread: AddPoll 20
UDev: Begin monitoring
Detecting mounts through /proc/self/mounts
PollThread: AddPoll 21
Creating TFileSystemFileSource
FileSystemWatcher thread starting
frmMain.frmMainShow

Here I close the window of DC, from X

PollThread: RemovePoll 13
PollThread: AddPoll 13
Finished Double Commander
Destroying main form
Drive watcher finished
Waiting for workers thread 00000000027BFC88
Finalized workers thread   00000000027BFC88
Waiting for FileSystemWatcher thread
FileSystemWatcher thread finished
Waiting for workers thread 00000000027C0998
Finalized workers thread   00000000027C0998
Destroying TFileSystemFileSource when refcount=0
Main form destroyed
Finishing GuiMessageQueue
Shutting down PixmapManager
PollThread: RemovePoll 13
PollThread: Finish polling
An unhandled exception occurred at $00007FD7B566C36E:
EAccessViolation: 
  $00007FD7B566C36E in /usr/lib/libQt5Core.so.5