Comment # 1 on bug 937100 from Hrvoje Senjan

Please install libQt5Gui5-debuginfo, and generate backtrace again. I do believe
this bug though has been resolved in Qt 5.5. The fixes are too intrusive to be
backported to 5.4.x release. We're preparing 5.5 in KDE:Qt5 repository if you
will be able to test that one. Will let you know once it's ready for 13.2.