ASSERT failure in QVector<T>::at: "index out of range", file /usr/include/qt5/QtCore/qvector.h, line 377

Program received signal SIGABRT, Aborted.
0x6ffdb424 in __kernel_vsyscall ()
(gdb) bt
#0  0x6ffdb424 in __kernel_vsyscall ()
#1  0x6e99bc50 in raise () from /lib/libc.so.6
#2  0x6e99fc55 in abort () from /lib/libc.so.6
#3  0x6ecf45f3 in QMessageLogger::fatal(char const*, ...) const ()
   from /usr/lib/libQt5Core.so.5
#4  0x6ecef9ed in qt_assert_x(char const*, char const*, char const*, int) ()
   from /usr/lib/libQt5Core.so.5
#5  0x69cb2887 in ?? () from /usr/lib/qt5/qml/org/nemomobile/contacts/libnemocontacts.so
#6  0x69ccaf46 in ?? () from /usr/lib/qt5/qml/org/nemomobile/contacts/libnemocontacts.so
#7  0x69cdca2c in ?? () from /usr/lib/qt5/qml/org/nemomobile/contacts/libnemocontacts.so
#8  0x69cdcf2e in ?? () from /usr/lib/qt5/qml/org/nemomobile/contacts/libnemocontacts.so
#9  0x6eeceea7 in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) ()
   from /usr/lib/libQt5Core.so.5
#10 0x6f97ec2f in ?? () from /usr/lib/libQt5Qml.so.5
#11 0x6f980070 in ?? () from /usr/lib/libQt5Qml.so.5
#12 0x6f980426 in ?? () from /usr/lib/libQt5Qml.so.5