#0  0xf65b36af in QV4::Value::isManaged (this=<optimized out>) at ../../include/QtQml/5.6.1/QtQml/private/../../../../../src/qml/jsruntime/qv4value_p.h:305
#1  QV4::Value::as<QV4::Object> (this=0xf1201318) at ../../include/QtQml/5.6.1/QtQml/private/../../../../../src/qml/jsruntime/qv4managed_p.h:192
#2  QQmlBinding::QQmlBinding (this=0x8381690, functionPtr=..., obj=0x837df40, ctxt=0x82ae2d0) at qml/qqmlbinding.cpp:133
#3  0xf104b65e in UCStyleHints::_q_applyStyleHints() () from /usr/lib/i386-linux-gnu/libUbuntuToolkit.so.5
#4  0xf107430c in ?? () from /usr/lib/i386-linux-gnu/libUbuntuToolkit.so.5
#5  0xf7d5666f in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5
#6  0xf7d56bad in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/i386-linux-gnu/sse2/libQt5Core.so.5
#7  0xf1047ad2 in UCStyledItemBase::styleInstanceChanged() () from /usr/lib/i386-linux-gnu/libUbuntuToolkit.so.5
#8  0xf104916d in UCStyledItemBasePrivate::loadStyleItem(bool) () from /usr/lib/i386-linux-gnu/libUbuntuToolkit.so.5
#9  0xf1047c7b in UCStyledItemBasePrivate::completeComponentInitialization() () from /usr/lib/i386-linux-gnu/libUbuntuToolkit.so.5
#10 0xf65bfd5b in QQmlObjectCreator::finalize (this=0x820e3e8, interrupt=...) at qml/qqmlobjectcreator.cpp:1206
#11 0xf654524e in QQmlComponentPrivate::complete (enginePriv=0x8086ea0, state=0x81c07ac) at qml/qqmlcomponent.cpp:919
#12 0xf6545312 in QQmlComponentPrivate::completeCreate (this=0x81c0750) at qml/qqmlcomponent.cpp:955
#13 0xf654535b in QQmlComponent::completeCreate (this=0x81c0740) at qml/qqmlcomponent.cpp:948
#14 0xf6545169 in QQmlComponent::create (this=0x81c0740, context=<optimized out>) at qml/qqmlcomponent.cpp:781
#15 0xf69908eb in QQuickView::continueExecute() () from /usr/lib/i386-linux-gnu/libQt5Quick.so.5
#16 0xf6990e3c in QQuickViewPrivate::execute() () from /usr/lib/i386-linux-gnu/libQt5Quick.so.5
#17 0xf6990fbf in QQuickView::setSource(QUrl const&) () from /usr/lib/i386-linux-gnu/libQt5Quick.so.5
#18 0xf7faeec5 in quick_test_main(int, char**, char const*, char const*) () from /usr/lib/i386-linux-gnu/libQt5QuickTest.so.5
#19 0x08048512 in ?? ()
#20 0xf7915276 in __libc_start_main (main=0x80484e0, argc=7, argv=0xffffd3e4, init=0x8048630, fini=0x8048690, rtld_fini=0xf7fe88a0 <_dl_fini>, stack_end=0xffffd3dc) at ../csu/libc-start.c:291
#21 0x08048540 in ?? ()