Often or maybe always, when I close the Falkon window the KDE application Dr Konqi returns this information:

"Unfortunately the program has been stopped unexpectedly" (translated by myself from German into English).

I let Dr Konqi start to collect information for a bug report. This is the result:

"Application: Falkon (falkon), signal: Segmentation fault

[KCrash Handler]
#4  0x00007fb4cf6e8a2a in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#5  0x00007fb4d02ff2a1 in History::resetHistory() () from /home/xxx/programme/falkon_git_clone/falkon/bin/lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#6  0x00007fb4d03e1ba1 in History::clearHistory() () from /home/xxx/programme/falkon_git_clone/falkon/bin/lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#7  0x00007fb4d037a442 in MainApplication::saveSettings() () from /home/xxx/programme/falkon_git_clone/falkon/bin/lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#8  0x00007fb4d0352e53 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (MainApplication::*)()>::call(void (MainApplication::*)(), MainApplication*, void**) () from /home/xxx/programme/falkon_git_clone/falkon/bin/lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#9  0x00007fb4d0352c69 in void QtPrivate::FunctionPointer<void (MainApplication::*)()>::call<QtPrivate::List<>, void>(void (MainApplication::*)(), MainApplication*, void**) () from /home/xxx/programme/falkon_git_clone/falkon/bin/lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#10 0x00007fb4d0352859 in QtPrivate::QSlotObject<void (MainApplication::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) () from /home/xxx/programme/falkon_git_clone/falkon/bin/lib/x86_64-linux-gnu/libFalkonPrivate.so.3
#11 0x00007fb4cf6e8f4f in ?? () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#12 0x00007fb4cf6b07ea in QCoreApplication::aboutToQuit(QCoreApplication::QPrivateSignal) () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#13 0x00007fb4cf6b4b49 in QCoreApplicationPrivate::execCleanup() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#14 0x00007fb4cf6b82f0 in QCoreApplication::exec() () from /lib/x86_64-linux-gnu/libQt5Core.so.5
#15 0x000055dbf24d780a in main ()
[Inferior 1 (process 4952) detached]"

Dr Konqi states: "The collected information about the crash is probably useless".

Note: I am noticing this behavior often since I recompiled Falkon in the Falkon project directory in my Home directory, where I ran a "make uninstall" in the build directory of my Falkon project directory, a cmake with the "-D BUILD_PYTHON_SUPPORT=ON" option in the cmake command line, then make, make install.

During my first compilation of Falkon I did not use the "-D BUILD_PYTHON_SUPPORT=ON" option in the cmake command line.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8