Segmentation fault - MapPolygon

Program received signal SIGSEGV, Segmentation fault.
0x00007fffd9d96ad8 in p2t::Triangle::EdgeIndex (this=0x0, p1=0x1c7e2e0, p2=0x1cd6d10)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/common/shapes.cpp:167
167	  if (points_[0] == p1) {
#0  0x00007fffd9d96ad8 in p2t::Triangle::EdgeIndex (this=0x0, p1=0x1c7e2e0, p2=0x1cd6d10)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/common/shapes.cpp:167
#1  0x00007fffd9d933d8 in p2t::Sweep::IsEdgeSideOfTriangle (this=0x1cd5920, triangle=..., ep=..., eq=...)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/sweep.cpp:165
#2  0x00007fffd9d930f3 in p2t::Sweep::EdgeEvent (this=0x1cd5920, tcx=..., ep=..., eq=..., triangle=0x0, point=...)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/sweep.cpp:110
#3  0x00007fffd9d931b5 in p2t::Sweep::EdgeEvent (this=0x1cd5920, tcx=..., ep=..., eq=..., triangle=0x0, point=...)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/sweep.cpp:123
#4  0x00007fffd9d931b5 in p2t::Sweep::EdgeEvent (this=0x1cd5920, tcx=..., ep=..., eq=..., triangle=0x1cdd700, point=...)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/sweep.cpp:123
#5  0x00007fffd9d930a7 in p2t::Sweep::EdgeEvent (this=0x1cd5920, tcx=..., edge=0x1cf9a60, node=0x1ca5c40)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/sweep.cpp:105
#6  0x00007fffd9d92e82 in p2t::Sweep::SweepPoints (this=0x1cd5920, tcx=...)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/sweep.cpp:57
#7  0x00007fffd9d92d90 in p2t::Sweep::Triangulate (this=0x1cd5920, tcx=...)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/sweep.cpp:46
#8  0x00007fffd9d92960 in p2t::CDT::Triangulate (this=0x1cd03b0)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/3rdparty/poly2tri/sweep/cdt.cpp:52
#9  0x00007fffd9d5ba4c in QGeoMapPolygonGeometry::updateScreenPoints (this=0x1cdb870, map=...)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/imports/location/qdeclarativepolygonmapitem.cpp:287
#10 0x00007fffd9d5c9bb in QDeclarativePolygonMapItem::updatePolish (this=0x1cdb7e0)
    at /home/kuba/Qt/5.6/Src/qtlocation/src/imports/location/qdeclarativepolygonmapitem.cpp:531
#11 0x00007ffff70cbb48 in QQuickWindowPrivate::polishItems() () from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Quick.so.5
#12 0x00007ffff709806e in ?? () from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Quick.so.5
#13 0x00007ffff7099271 in ?? () from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Quick.so.5
#14 0x00007ffff5a34d2a in QCoreApplication::notify(QObject*, QEvent*) () from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Core.so.5
#15 0x00007ffff5a34e80 in QCoreApplication::notifyInternal2(QObject*, QEvent*) ()
   from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Core.so.5
#16 0x00007ffff5a8333e in QTimerInfoList::activateTimers() () from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Core.so.5
#17 0x00007ffff5a83841 in ?? () from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Core.so.5
#18 0x00007ffff0d47ff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007ffff0d48250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007ffff0d482fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007ffff5a844e7 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Core.so.5
#22 0x00007ffff5a32efa in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Core.so.5
#23 0x00007ffff5a3ad9d in QCoreApplication::exec() () from /home/kuba/Qt/5.6/gcc_64/lib/libQt5Core.so.5