This issue occurs under unspecified circumstances.
Bug trace:
" "[New LWP 4677]
[New LWP 4678]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1". 0x00007f46
5c81bb57 in waitpid () from /lib64/libpthread.so.0
#0 0x00007f465c81bb57 in waitpid () at /lib64/libpthread.so.0
#1 0x000000000043b4b1 in crashTrapper(int)
(sig=11) at tupcrashhandler.cpp:321
#2 0x00007f465c81c270 in
() at /lib64/libpthread.so.0 #3 0x0000000000428277 in QListData::size()
const (this=0x5d2d350) at /home/xtingray/Qt5.12.2/5.12.2/gcc_64/include/QtCore/qlist.h:113 #4 0x00007f46605c6f8c in QList<TupLayer*>::count() const (this=0x5d2d35
0) at /home/xtingray/Qt5.12.2/5.12.2/gcc_64/include/QtCore/qlist.h:345 #5 0x00007f46605c156d in TupScene::layerAt(int) const (this=0x5d2d310, position=0) at tupsce
ne.cpp:248 #6 0x00007f46600c9ec5 in TupGraphicsScene::drawPhotogram(int, bool) (this=0x7f464c0282a0, photogram=0, drawContext=true) at tupgraphicsscene.cpp:207
#7 0x00007f4661e63cda in TupPaintArea::frameResponse(TupFrameResponse*) (this=0x3fa4890, response=0x4cd06b0) at tuppaintarea.cpp:343 #8 0x00007f46606019f2 in T
upAbstractProjectResponseHandler::handleResponse(TupProjectResponse*) (this=0x3fa4988, response=0x4cd06b0) at tupabstractprojectresponsehandler.cpp:74 #9 0x00007f4
661e786fa in TupDocumentView::handleProjectResponse(TupProjectResponse*) (this=0x41236a0, response=0x4cd06b0) at tupdocumentview.cpp:1117 #10 0x00007f4661eb8d42 in
TupDocumentView::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=0x41236a0, _c=QMetaObject::InvokeMetaMethod, _id=65, _a=0x7ffd9d64d390) at .moc/moc_tup
documentview.cpp:440 #11 0x00007f465cf57989 in QMetaObject::activate(QObject*, int, int, void**) () at /home/xtingray/Qt5.12.2/5.12.2/gcc_64/lib/libQt5Core.so.5 #12 0x00007f466061ffa9 in TupProjectManager::responsed(TupProjectResponse*) (this=0x1402250, _t1=0x4cd06b0) at .moc/moc_tupprojectmanager.cpp:182 #13 0x00007f
46605d13a3 in TupProjectManager::handleLocalRequest(TupProjectRequest const*) (this=0x1402250, request=0x7ffd9d64d6a0) at tupprojectmanager.cpp:401 #14 0x00007f466
061fce8 in TupProjectManager::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=0x1402250, _c=QMetaObject::InvokeMetaMethod, _id=3, _a=0x7ffd9d64d670) at .
moc/moc_tupprojectmanager.cpp:112 #15 0x00007f465cf57989 in QMetaObject::activate(QObject*, int, int, void**) () at /home/xtingray/Qt5.12.2/5.12.2/gcc_64/lib/libQt
5Core.so.5 #16 0x00007f46600d6c7f in TupModuleWidgetBase::localRequestTriggered(TupProjectRequest const*) (this=0x20fa6f0, _t1=0x7ffd9d64d6a0) at .moc/moc_tupmodul
ewidgetbase.cpp:191 #17 0x00007f466135af21 in TupExposureSheet::selectFrame(int, int) (this=0x20fa6f0, layerIndex=0, frameIndex=0) at tupexposuresheet.cpp:577 #18 0x00007f466136d80f in TupExposureSheet::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=0x20fa6f0, _c=QMetaObject::InvokeMetaMethod, _id=15, _a=0x
7ffd9d64d9a0) at .moc/moc_tupexposuresheet.cpp:172
#19 0x00007f465cf57989 in QMetaObject::activate(QObject*, int, int, void**) () at /home/xtingray/Qt5.12.2/5.12.2
/gcc_64/lib/libQt5Core.so.5 #20 0x00007f466136f0e5 in TupExposureTable::frameSelected(int, int) (this=0x3ca9e00, _t1=0, _t2=0) at .moc/moc_tupexposuretable.cpp:324
#21 0x00007f4661366619 in TupExposureTable::requestFrameSelection(int, int, int, int) (this=0x3ca9e00, currentSelectedRow=0, currentColumn=0, previousRow=-1, prev
iousColumn=-1) at tupexposuretable.cpp:238 #22 0x00007f466136e90d in TupExposureTable::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) (_o=0x3ca9e00