This topic has been started by someone else in this closed thread http://www.catb.org/~esr/faqs/smart-questions.html
The last reply in the thread said the problem was fixed after doing the latest updates at that time. However, today I did a pacman upgrade, and installed inkscape. With these up to date state, I encountered the same problem described in the closed thread.
Here is what happened.
I selected an area containing multiple items including an image (size 228kb) and pressed the shortcut ctrl + c to copy it. But inkscape promptly crashed without warning and I lost all my progress. I reproduced the behavior by trying to copy the image and about 3 out of 5 times, it results in a crash.
The problem is however not seen at all when I disable the build in system tray clipboard manager from 'Configure system tray' window. I believe this is a serious bug as it could result in loss of precious hours.
Operating System: Manjaro Linux
KDE Plasma Version: 5.18.4
KDE Frameworks Version: 5.69.0
Qt Version: 5.14.2
Kernel Version: 5.4.23-1-MANJARO
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-2450M CPU @ 2.50GHz
Memory: 7.7 GiB of RAM
Inkscape crash log (Inkscape version 0.92.5)
The program 'inkscape' received an X Window System error. This probably reflects a bug in the program. The error was 'BadWindow (invalid Window parameter)'. (Details: serial 9397 error_code 3 request_code 18 minor_code 0) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. To debug your program, run it with the --sync command line option to change this behavior. You can then get a meaningful backtrace from your debugger if you break on the gdk_x_error() function.)
Steps to reproduce error:
Make sure system tray clipboard manager is enabled, import a 300 kb or above image to inkscape, select it and do a ctrl + c. In about 3-5 tries to copy the image, inkscape will crash.
Steps to troubleshoot error:
Disable system tray clipboard manager
I have to disable the clipboard, and inkscape is working fine, however the clipboard has proven useful outside of inkscape. Consider this a bug report as I do not know where else to report it. Any help with automatically disabling the build in clipboard manager while running inkscape is appreciated.