PlugIn use crashes QGis

[bipbipBE]

EACH time I use the plugin, QGis crashes after a while, generally during the M value typing :

Crash ID: 5ea53509406f55839b3d760e88388eb6fee0a3b8

Stack Trace

QMetaObject::cast :
QgsHighlight::paint qgshighlight.cpp:400
sipQgsHighlight::paint sip_guipart8.cpp:92134
QGraphicsScene::dragMoveEvent :
QGraphicsScene::drawItems :
QGraphicsScene::drawItems :
QGraphicsView::paintEvent :
QWidget::event :
QFrame::event :
QGraphicsView::viewportEvent :
QCoreApplicationPrivate::sendThroughObjectEventFilters :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify qgsapplication.cpp:471
QCoreApplication::notifyInternal2 :
QWidgetPrivate::drawWidget :
QWidgetPrivate::paintSiblingsRecursive :
QWidgetPrivate::drawWidget :
QWidgetPrivate::paintSiblingsRecursive :
QWidgetPrivate::drawWidget :
QWidgetPrivate::paintSiblingsRecursive :
QWidgetPrivate::drawWidget :
QWidgetPrivate::paintSiblingsRecursive :
QWidgetPrivate::paintSiblingsRecursive :
QWidgetPrivate::drawWidget :
QApplication::windowIcon :
QWidget::event :
QgisApp::event qgisapp.cpp:2201
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify qgsapplication.cpp:471
QCoreApplication::notifyInternal2 :
QCoreApplicationPrivate::sendPostedEvents :
QGraphicsScene::~QGraphicsScene :
QObject::event :
QGraphicsScene::event :
QApplicationPrivate::notify_helper :
QApplication::notify :
QgsApplication::notify qgsapplication.cpp:471
QCoreApplication::notifyInternal2 :
QCoreApplicationPrivate::sendPostedEvents :
qt_plugin_query_metadata :
QEventDispatcherWin32::processEvents :
UserCallWinProcCheckWow :
DispatchMessageWorker :
QEventDispatcherWin32::processEvents :
qt_plugin_query_metadata :
QEventLoop::exec :
QCoreApplication::exec :
main main.cpp:1637
BaseThreadInitThunk :
RtlUserThreadStart :

QGIS Info
QGIS Version: 3.18.0-Z�rich
QGIS code revision: bdef9fb328
Compiled against Qt: 5.11.2
Running against Qt: 5.11.2
Compiled against GDAL: 3.1.4
Running against GDAL: 3.1.4

System Info
CPU Type: x86_64
Kernel Type: winnt
Kernel Version: 10.0.19042