Bug 428471

SUMMARY
OS: OpenSUSE Tumbleweed
KDE: 5.75.0 / Plasma 5.20.1
STEPS TO REPRODUCE
After every(probably) boot.

OBSERVED RESULT
None. It just reported that it did crash.

EXPECTED RESULT
As above.

SOFTWARE/OS VERSIONS 
Linux/KDE Plasma: openSUSE Tumbleweed
(available in About System)
KDE Plasma Version: Plasma 5.20.1
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1

ADDITIONAL INFORMATION
DRkonqi couldn't report this error. "You couldn't report this error, because baloo_file doesn't provide adress of reported error." I translated it by myself, and it may sound different.
Below debugg information.

Application: baloo_file (baloo_file), signal: Segmentation fault

[New LWP 2184]
[New LWP 2666]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
0x00007f5164ecee7f in poll () from /lib64/libc.so.6
[Current thread is 1 (Thread 0x7f5162d17140 (LWP 2181))]

Thread 3 (Thread 0x7f115bfff640 (LWP 2666)):
[KCrash Handler]
#4  QHashData::nextNode (node=node@entry=0x7f11543c8650) at tools/qhash.cpp:591
#5  0x00007f5165890478 in QHash<QByteArray, QVector<Baloo::WriteTransaction::Operation> >::const_iterator::operator++ (this=0x7f115bffe948) at /usr/include/qt5/QtCore/qhash.h:1293
#6  QHashIterator<QByteArray, QVector<Baloo::WriteTransaction::Operation> >::next (this=0x7f115bffe940) at /usr/include/qt5/QtCore/qhash.h:1295
#7  Baloo::WriteTransaction::commit (this=<optimized out>) at /usr/src/debug/baloo5-5.75.0-1.1.x86_64/src/engine/writetransaction.cpp:278
#8  0x00007f516588483b in Baloo::Transaction::commit (this=this@entry=0x7f115bffeaa0) at /usr/src/debug/baloo5-5.75.0-1.1.x86_64/src/engine/transaction.cpp:275
#9  0x0000560434c52ad3 in Baloo::UnindexedFileIndexer::run (this=0x560436d3e250) at /usr/src/debug/baloo5-5.75.0-1.1.x86_64/src/file/unindexedfileindexer.cpp:61
#10 0x00007f51653a16f2 in QThreadPoolThread::run (this=0x560436c961a0) at thread/qthreadpool.cpp:100
#11 0x00007f516539d911 in QThreadPrivate::start (arg=0x560436c961a0) at thread/qthread_unix.cpp:329
#12 0x00007f51642f9eb1 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f5164ed9ccf in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f5160ecd640 (LWP 2184)):
#0  0x00007f5163abbec4 in g_mutex_unlock () from /usr/lib64/libglib-2.0.so.0
#1  0x00007f5163a6db05 in g_main_context_prepare () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f5163a6e51b in ?? () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f5163a6e70f in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#4  0x00007f51655d45cb in QEventDispatcherGlib::processEvents (this=0x7f515c000b60, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#5  0x00007f516557ba1b in QEventLoop::exec (this=this@entry=0x7f5160eccc70, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#6  0x00007f516539c7ce in QThread::exec (this=<optimized out>) at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#7  0x00007f51658b3a27 in ?? () from /usr/lib64/libQt5DBus.so.5
#8  0x00007f516539d911 in QThreadPrivate::start (arg=0x7f5165920d80) at thread/qthread_unix.cpp:329
#9  0x00007f51642f9eb1 in start_thread () from /lib64/libpthread.so.0
#10 0x00007f5164ed9ccf in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f5162d17140 (LWP 2181)):
#0  0x00007f5164ecee7f in poll () from /lib64/libc.so.6
#1  0x00007f5163a6e5ee in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f5163a6e70f in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f51655d45cb in QEventDispatcherGlib::processEvents (this=0x560436acb390, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#4  0x00007f516557ba1b in QEventLoop::exec (this=this@entry=0x7ffdd2220930, flags=..., flags@entry=...) at ../../include/QtCore/../../src/corelib/global/qflags.h:141
#5  0x00007f5165583c90 in QCoreApplication::exec () at ../../include/QtCore/../../src/corelib/global/qflags.h:121
#6  0x0000560434c40203 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/baloo5-5.75.0-1.1.x86_64/src/file/main.cpp:78
[Inferior 1 (process 2181) detached]