crash if i open project and then reopen other exists project

1. Open project (File -> Open)
2. Open other exists project (File -> Open)

Reproducible: Always

Steps to Reproduce:
1. Open project (File -> Open)
2. Open other exists project (File -> Open)
3.



Thread 1 "kdenlive" received signal SIGSEGV, Segmentation fault.
0x00007ffff21a2e07 in operator<(QString const&, QString const&) ()
   from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#1  0x00000000004a37a0 in ?? ()
(gdb) up
#2  0x00000000004bba75 in ?? ()
(gdb) up
#3  0x00000000004bbdee in ?? ()
(gdb) up
#4  0x00000000007e9473 in ?? ()
(gdb) up
#5  0x0000000000871970 in ?? ()
(gdb) up
#6  0x00007ffff2321ea1 in QObject::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#7  0x00007ffff38e9cdb in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#8  0x00007ffff38a705c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#9  0x00007ffff38ac516 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#10 0x00007ffff22f262b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#11 0x00007ffff22f4a26 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#12 0x00007ffff2348673 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#13 0x00007fffee6381a7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) up
#14 0x00007fffee638400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) up
#15 0x00007fffee6384ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) up
#16 0x00007ffff2348a7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#17 0x00000000004c3029 in ?? ()
(gdb) up
#18 0x000000000052028b in ?? ()
(gdb) up
#19 0x00000000005225bf in ?? ()
(gdb) up
#20 0x0000000000522a64 in ?? ()
(gdb) up
#21 0x00000000008622c5 in ?? ()
(gdb) up
#22 0x00007ffff2320fca in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#23 0x00007ffff389d412 in QAction::triggered(bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#24 0x00007ffff389f898 in QAction::activate(QAction::ActionEvent) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#25 0x00007ffff39a5560 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#26 0x00007ffff39a5694 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#27 0x00007ffff3a6a15a in QToolButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#28 0x00007ffff38e9f88 in QWidget::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#29 0x00007ffff3a6a239 in QToolButton::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#30 0x00007ffff38a705c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#31 0x00007ffff38acc19 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#32 0x00007ffff22f262b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#33 0x00007ffff38abb32 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#34 0x00007ffff390457b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#35 0x00007ffff3906b3b in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#36 0x00007ffff38a705c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#37 0x00007ffff38ac516 in QApplication::notify(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5
(gdb) up
#38 0x00007ffff22f262b in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#39 0x00007ffff2634521 in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
(gdb) up
#40 0x00007ffff26361e5 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
(gdb) up
#41 0x00007ffff2619f38 in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Gui.so.5
(gdb) up
#42 0x00007fffe5252070 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5XcbQpa.so.5
(gdb) up
#43 0x00007fffee6381a7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) up
#44 0x00007fffee638400 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) up
#45 0x00007fffee6384ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
(gdb) up
#46 0x00007ffff2348a7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#47 0x00007ffff22efdea in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#48 0x00007ffff22f7e8c in QCoreApplication::exec() () from /usr/lib/x86_64-linux-gnu/libQt5Core.so.5
(gdb) up
#49 0x0000000000489f62 in ?? ()
(gdb) up
#50 0x00007ffff1638830 in __libc_start_main (main=0x489060, argc=1, argv=0x7fffffffdfb8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffffffdfa8)
    at ../csu/libc-start.c:291
291	../csu/libc-start.c: Нет такого файла или каталога.
(gdb) up
#51 0x000000000048a7e9 in _start ()