SUMMARY
***
Frequent kioslave5 crashes in Dolphin window browser.

Backtrace:
Application: kioslave5 (kioslave5), signal: Segmentation fault

[KCrash Handler]
#4  0x00007f5a876686d8 in QTextLine::y() const () from /usr/lib64/libQt5Gui.so.5
#5  0x00007f5a70717edf in KoTextDocumentLayout::positionAnchorTextRanges(int, int, QTextDocument const*) () from /usr/lib64/libkotextlayout.so.17
#6  0x00007f5a706faae8 in KoTextLayoutArea::layoutBlock(FrameIterator*) () from /usr/lib64/libkotextlayout.so.17
#7  0x00007f5a706fdc30 in KoTextLayoutArea::layout(FrameIterator*) () from /usr/lib64/libkotextlayout.so.17
#8  0x00007f5a707157ed in KoTextLayoutRootArea::layoutRoot(FrameIterator*) () from /usr/lib64/libkotextlayout.so.17
#9  0x00007f5a70718a98 in KoTextDocumentLayout::doLayout() () from /usr/lib64/libkotextlayout.so.17
#10 0x00007f5a707192f8 in KoTextDocumentLayout::layout() () from /usr/lib64/libkotextlayout.so.17
#11 0x00007f5a53de3765 in KWPage::thumbnail(QSize const&, KoShapeManager*, bool) const () from /usr/lib64/libwordsprivate.so.17
#12 0x00007f5a53dd7968 in KWDocument::generatePreview(QSize const&) () from /usr/lib64/libwordsprivate.so.17
#13 0x00007f5a7103a9ac in ?? () from /usr/lib64/qt5/plugins/calligrathumbnail.so
#14 0x00007f5a8bdd2d16 in ?? () from /usr/lib64/qt5/plugins/kf5/kio/thumbnail.so
#15 0x00007f5a8bdd45f6 in ?? () from /usr/lib64/qt5/plugins/kf5/kio/thumbnail.so
#16 0x00007f5a8bdd5511 in ?? () from /usr/lib64/qt5/plugins/kf5/kio/thumbnail.so
#17 0x00007f5a8bdd6b59 in ?? () from /usr/lib64/qt5/plugins/kf5/kio/thumbnail.so
#18 0x00007f5a8bcbe1a6 in KIO::SlaveBase::dispatch(int, QByteArray const&) () from /usr/lib64/libKF5KIOCore.so.5
#19 0x00007f5a8bcbead6 in KIO::SlaveBase::dispatchLoop() () from /usr/lib64/libKF5KIOCore.so.5
#20 0x00007f5a8bdd35bb in kdemain () from /usr/lib64/qt5/plugins/kf5/kio/thumbnail.so
#21 0x0000000000401362 in ?? ()
#22 0x00007f5a8add9a37 in __libc_start_call_main () from /lib64/libc.so.6
#23 0x00007f5a8add9aec in __libc_start_main_impl () from /lib64/libc.so.6
#24 0x0000000000401571 in ?? ()
[Inferior 1 (process 27936) detached]

***


STEPS TO REPRODUCE
1. Open Dolphin
2. Copy a file
3. Paste into a different directory
or
1. As above
2. Go to any directory
3. Switch to a different app, like internet browser or multimedia.
4. Go back to Dolphin
5. In Dolphin still, change to a different directory using one of the items in left side menu, like "recent files"
6. Crash and Dr. Konqi message appears. 

OBSERVED RESULT
Dr. Konqi window with message about kioslave5 crash.

EXPECTED RESULT
Regular operation; no crash that spurs a Dr. Konqi message. 

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
Operating System: Slackware 15.0
KDE Plasma Version: 5.24.4
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3
Kernel Version: 5.10.41 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620

ADDITIONAL INFORMATION
This happens multiple times/day. Doing normal things like going between directories, copying files files between directories. All while using Dolphin.