segmentation fault when trying to update

Click on tray icon, then "Update", it says "Loading" for a while, then closes without further messages: No drKonqui, no automatic crash report, nothing.

$ gdb plasma-discover
GNU gdb (Ubuntu 7.11-0ubuntu1) 7.11
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Reading symbols from plasma-discover...(no debugging symbols found)...done.
(gdb) r
Starting program: /usr/bin/plasma-discover
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe6a8a700 (LWP 5948)]
[New Thread 0x7fffd9985700 (LWP 5949)]
[New Thread 0x7fffd8f4c700 (LWP 5950)]
[New Thread 0x7fffd2dfc700 (LWP 5951)]
log_attica_plugin: Loaded paths from config: (QUrl("http://download.kde.org/ocs/providers.xml"))
knewstuff: Initializing KNS3::Engine from ' "/etc/xdg/comic.knsrc" '
knewstuff: Loading KNewStuff3 config: "/etc/xdg/comic.knsrc"
knewstuff: Categories: ("Plasma Comic")
knewstuff: Using registry file: "/home/manu/.local/share/knewstuff3/.knsregistry"
knewstuff: Loading KNS2 registry of files for the component: ""
knewstuff: Cache read... entries: 0
knewstuff: loading providers from "http://download.kde.org/ocs/providers.xml"
knewstuff: XmlLoader::load(): url: QUrl("http://download.kde.org/ocs/providers.xml")
log_attica_plugin: Loaded paths from config: (QUrl("http://download.kde.org/ocs/providers.xml"))
knewstuff: Initializing KNS3::Engine from ' "/etc/xdg/plasmoids.knsrc" '
knewstuff: Loading KNewStuff3 config: "/etc/xdg/plasmoids.knsrc"
knewstuff: Categories: ("Plasma 5 Plasmoid")
knewstuff: Loading KNS2 registry of files for the component: ""
knewstuff: Cache read... entries: 0
knewstuff: loading providers from "http://download.kde.org/ocs/providers.xml"
knewstuff: XmlLoader::load(): url: QUrl("http://download.kde.org/ocs/providers.xml")
[New Thread 0x7fffc7847700 (LWP 5961)]
log_attica_plugin: Loaded paths from config: (QUrl("http://download.kde.org/ocs/providers.xml"))
knewstuff: XmlLoader::slotJobData()
knewstuff: XmlLoader::slotJobData()
knewstuff: --Xml Loader-START--
knewstuff: "<providers>\n\n<provider>\n <id>kde-look</id>\n <location>http://api.kde-look.org/v1/</location>\n <name>kde-look.org</name>\n <termsofuse>http://kde-look.org/terms/</termsofuse>\n <services>\n <person ocsversion=\"1.3\" />\n <friend ocsversion=\"1.3\" />\n <message ocsversion=\"1.3\" />\n <activity ocsversion=\"1.3\" />\n <content ocsversion=\"1.3\" />\n <fan ocsversion=\"1.3\" />\n <knowledgebase ocsversion=\"1.3\" />\n <event ocsversion=\"1.3\" />\n </services>\n</provider>\n\n</providers>\n"
knewstuff: --Xml Loader-END--
knewstuff: slotProvidersLoaded
knewstuff: Provider attributes: ""
log_attica_plugin: No credentials found
knewstuff: Engine addProvider called with provider with id "http://api.kde-look.org/v1/"
knewstuff: XmlLoader::slotJobData()
knewstuff: XmlLoader::slotJobData()
knewstuff: --Xml Loader-START--
knewstuff: "<providers>\n\n<provider>\n <id>kde-look</id>\n <location>http://api.kde-look.org/v1/</location>\n <name>kde-look.org</name>\n <termsofuse>http://kde-look.org/terms/</termsofuse>\n <services>\n <person ocsversion=\"1.3\" />\n <friend ocsversion=\"1.3\" />\n <message ocsversion=\"1.3\" />\n <activity ocsversion=\"1.3\" />\n <content ocsversion=\"1.3\" />\n <fan ocsversion=\"1.3\" />\n <knowledgebase ocsversion=\"1.3\" />\n <event ocsversion=\"1.3\" />\n </services>\n</provider>\n\n</providers>\n"
knewstuff: --Xml Loader-END--
knewstuff: slotProvidersLoaded
knewstuff: Provider attributes: ""
log_attica_plugin: No credentials found
knewstuff: Engine addProvider called with provider with id "http://api.kde-look.org/v1/"
log_attica_plugin: No credentials found
knewstuff: providerInitialized "kde-look.org"
knewstuff: providers loaded
knewstuff: providerInitialized "kde-look.org"
knewstuff: providers loaded
Found invalid category "Plasma Comic"
invalid kns backend!
Discarding invalid backend "knscomics-backend"
knewstuff: Write registry
knewstuff: loaded page 0 current page 0
knewstuff: "0,,,0,100" add: 39 keys: ("0,,,0,100")

Thread 1 "plasma-discover" received signal SIGSEGV, Segmentation fault.
0x00007ffff75cffda in ResourcesUpdatesModel::isProgressing() const () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
(gdb) bt
#0 0x00007ffff75cffda in ResourcesUpdatesModel::isProgressing() const () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#1 0x00007ffff75dc4c5 in ?? () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#2 0x00007ffff75df43b in ResourcesUpdatesModel::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#3 0x00007ffff73916de in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#4 0x00007ffff73925ed in QV4::QObjectWrapper::getProperty(QObject*, QV4::ExecutionContext*, QQmlPropertyData*, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#5 0x00007ffff73a8c0b in QV4::Runtime::getQmlQObjectProperty(QV4::ExecutionEngine*, QV4::Value const&, int, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#6 0x00007fffd80253eb in ?? ()
#7 0x0000000000732ce0 in ?? ()
#8 0x0000000000732ce0 in ?? ()
#9 0x0003000000000001 in ?? ()
#10 0x00007fffd38010d8 in ?? ()
#11 0x0000000000000001 in ?? ()
#12 0x00007fffd38010d0 in ?? ()
#13 0x00007fffd3801058 in ?? ()
#14 0x00007fffd3801060 in ?? ()
#15 0x0000000000732ce0 in ?? ()
#16 0x00007ffff734777a in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#17 0x00007ffff74307ff in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#18 0x00007ffff7430d1d in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#19 0x00007ffff743783c in QQmlBinding::update(QFlags<QQmlPropertyPrivate::WriteFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#20 0x00007ffff7437cfe in QQmlBinding::expressionChanged(QQmlJavaScriptExpression*) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#21 0x00007ffff7413bae in QQmlNotifier::emitNotify(QQmlNotifierEndpoint*, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#22 0x00007ffff73b686c in QQmlData::signalEmitted(QAbstractDeclarativeData*, QObject*, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#23 0x00007ffff51a98a0 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#24 0x00007ffff75da0ef in UpdateModel::hasUpdatesChanged(bool) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#25 0x00007ffff75c736a in UpdateModel::setResources(QList<AbstractResource*> const&) () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#26 0x00007ffff75c7933 in UpdateModel::activityChanged() () from /usr/lib/x86_64-linux-gnu/plasma-discover/libDiscoverCommon.so
#27 0x00007ffff51a9e4f in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#28 0x00007ffff51a9e4f in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#29 0x00007ffff51a9e4f in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#30 0x00007fffd1bd8e21 in KNSBackend::statusChanged(KNS3::Entry const&) () from /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/kns-backend.so
#31 0x00007fffd1bd90c8 in KNSBackend::receivedEntries(QList<KNS3::Entry> const&) () from /usr/lib/x86_64-linux-gnu/qt5/plugins/discover/kns-backend.so
#32 0x00007ffff51a9e4f in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#33 0x00007fffd1920f22 in KNS3::DownloadManager::searchResult(QList<KNS3::Entry> const&) () from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
#34 0x00007fffd1921856 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
#35 0x00007ffff51a9fca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#36 0x00007fffd197ec55 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
#37 0x00007fffd1928381 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
#38 0x00007fffd19810b2 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
#39 0x00007ffff51a9fca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#40 0x00007fffd197f19a in ?? () from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
#41 0x00007fffd196d59a in ?? () from /usr/lib/x86_64-linux-gnu/libKF5NewStuff.so.5
#42 0x00007ffff51a9e4f in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#43 0x00007ffff2d9fd4f in Attica::BaseJob::finished(Attica::BaseJob*) () from /usr/lib/x86_64-linux-gnu/libKF5Attica.so.5
#44 0x00007ffff2d58618 in Attica::BaseJob::dataFinished() () from /usr/lib/x86_64-linux-gnu/libKF5Attica.so.5
#45 0x00007ffff2da0045 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5Attica.so.5
#46 0x00007ffff51a9fca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#47 0x00007ffff7f74065 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Network.so.5
#48 0x00007ffff5186aea in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#49 0x00007ffff518c1ad in QMetaObject::invokeMethod(QObject*, char const*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#50 0x00007ffff42c4652 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5KIOWidgets.so.5
#51 0x00007ffff42c6400 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5KIOWidgets.so.5
#52 0x00007ffff51a9fca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#53 0x00007ffff65756c2 in KJob::result(KJob*, KJob::QPrivateSignal) () from /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#54 0x00007ffff6576281 in KJob::finishJob(bool) () from /usr/lib/x86_64-linux-gnu/libKF5CoreAddons.so.5
#55 0x00007fffefaf866b in KIO::SimpleJob::slotFinished() () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#56 0x00007fffefb039d6 in KIO::TransferJob::slotFinished() () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#57 0x00007fffefb03101 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#58 0x00007ffff51a9fca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#59 0x00007fffefadc421 in KIO::SlaveInterface::dispatch(int, QByteArray const&) () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#60 0x00007fffefad9a47 in KIO::SlaveInterface::dispatch() () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#61 0x00007fffefaddf91 in KIO::Slave::gotInput() () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#62 0x00007fffefb5afd5 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#63 0x00007ffff51a9fca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#64 0x00007fffefa8c343 in ?? () from /usr/lib/x86_64-linux-gnu/libKF5KIOCore.so.5
#65 0x00007ffff51aaea1 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#66 0x00007ffff5a6e05c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#67 0x00007ffff5a73516 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
#68 0x00007ffff517b62b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#69 0x00007ffff517da26 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#70 0x00007ffff51d1673 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#71 0x00007ffff1acf127 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#72 0x00007ffff1acf380 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#73 0x00007ffff1acf42c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#74 0x00007ffff51d1a7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#75 0x00007ffff5178dea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#76 0x00007ffff5180e8c in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
#77 0x000000000040a545 in ?? ()
#78 0x00007ffff47ca830 in __libc_start_main (main=0x409790, argc=1, argv=0x7fffffffde68, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7fffffffde58) at ../csu/libc-start.c:291
#79 0x000000000040a729 in _start ()

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: plasma-discover 5.6.2-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: KDE
Date: Sun May 29 21:21:27 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-05-13 (15 days ago)
InstallationMedia: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: plasma-discover
UpgradeStatus: No upgrade log present (probably fresh install)