https://bugs.kde.org/show_bug.cgi?id=404052
--- Comment #8 from Sandro Knauß <skna...@kde.org> --- The backtrace is now showing the correct traceback and we can see at what line it went off. But this look fine and you have valid looking this=0x564f98590fb0. It looks like dvratil already said, like we try to access an already deleted item. That's why we need valgrind. #6 0x00007f24f76de15a in QHash<QByteArray, Akonadi::Attribute*>::findNode(QByteArray const&, unsigned int*) const (this=this@entry=0x28, akey=..., ahp=ahp@entry=0x0) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:926 #7 0x00007f24f77242ef in QHash<QByteArray, Akonadi::Attribute*>::contains(QByteArray const&) const (akey=..., this=0x28) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qhash.h:904 #8 0x00007f24f77242ef in Akonadi::Item::hasAttribute(QByteArray const&) const (this=this@entry=0x7f24f94e8630, type=...) at ./src/core/item.cpp:253 #9 0x00007f24f780ea7e in Akonadi::EntityTreeModelPrivate::isHiddenImpl<Akonadi::Item>(Akonadi::Item const&, Node::Type) const (this=0x564f98590fb0, entity=..., type=<optimized out>) at ./src/core/models/entitytreemodel_p.cpp:281 #10 0x00007f24f780c154 in Akonadi::EntityTreeModelPrivate::isHidden(Akonadi::Item const&) const (item=..., this=0x564f98590fb0) at ./src/core/models/entitytreemodel_p.cpp:1118 #11 0x00007f24f780c154 in Akonadi::EntityTreeModelPrivate::monitoredItemRemoved(Akonadi::Item const&, Akonadi::Collection const&) (this=this@entry=0x564f98590fb0, item=..., parentCollection=...) at ./src/core/models/entitytreemodel_p.cpp:1118 -- You are receiving this mail because: You are the assignee for the bug.