Closing Projects in QViewer crashes QGIS

[joewheaton]

Ryan Thomas's Version QGIS 3.34 and latest version of Viewer. When he has multiple projects opened and attempts to close one, QGIS crashes.

See: https://riverscapes.freshdesk.com/a/tickets/252

I could not reproduce this on my machine yet.

## Report Details

**Python Stack Trace**

Windows fatal exception: access violation

Current thread 0x0000425c (most recent call first):
File "C:\Users/ryanb/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\riverscapes_viewer\src\dock_widget.py", line 663 in open_menu
self.menu.exec_(self.treeView.viewport().mapToGlobal(position))

**Stack Trace**

RtlpWaitOnCriticalSection :
RtlpEnterCriticalSectionContended :
RtlEnterCriticalSection :
xmlDictFree :
xmlHashFree :
xmlFreeDoc :
PyGen_Finalize :
PyGen_Finalize :
PyErr_WarnFormat :
PyGen_Finalize :
PyDict_Clear :
PyDict_Clear :
PyInit_QtCore :
PyInit_QtCore :
QObject::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QCoreApplicationPrivate::sendPostedEvents :
qt_plugin_query_metadata :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QMenu::exec :
QMenu::exec :
PyInit_QtWidgets :
PyLong_FromString :
PyObject_Vectorcall :
PyObject_Vectorcall :
PyEval_EvalFrameDefault :
PyFunction_Vectorcall :
PyArg_CheckPositional :
PyObject_Call :
PyObject_Call :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
PyInit_QtCore :
QObject::qt_static_metacall :
QWidget::customContextMenuRequested :
QWidget::event :
QFrame::event :
QAbstractItemView::viewportEvent :
PyInit_QtWidgets :
QCoreApplicationPrivate::sendThroughObjectEventFilters :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QSizePolicy::QSizePolicy :
QSizePolicy::QSizePolicy :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify :
QCoreApplication::notifyInternal2 :
QGuiApplicationPrivate::processMouseEvent :
QWindowSystemInterface::sendWindowSystemEvents :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main :
BaseThreadInitThunk :
RtlUserThreadStart :

**QGIS Info**
QGIS Version: 3.34.15-Prizren
QGIS code revision: 386f2583
Compiled against Qt: 5.15.13
Running against Qt: 5.15.13
Compiled against GDAL: 3.10.1
Running against GDAL: 3.10.1



**System Info**
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.22631