diff --git a/toonz/sources/toonz/filmstrip.cpp b/toonz/sources/toonz/filmstrip.cpp
index 5c2824c..34ccd67 100644
--- a/toonz/sources/toonz/filmstrip.cpp
+++ b/toonz/sources/toonz/filmstrip.cpp
@@ -486,7 +486,11 @@ void FilmstripFrames::hideEvent(QHideEvent *) {
   // active viewer change
   disconnect(app, SIGNAL(activeViewerChanged()), this, SLOT(getViewer()));
 
-  if (m_viewer) {
+  // if the level strip is floating during shutting down Tahoma2D
+  // it can cause a crash disconnecting from the viewer which was already
+  // destroyed.  Checking the fps is a janky way to ensure the viewer is 
+  // stil relevant.
+  if (m_viewer && m_viewer->getFPS() > -100) { 
     disconnect(m_viewer, SIGNAL(onZoomChanged()), this, SLOT(update()));
     disconnect(m_viewer, SIGNAL(refreshNavi()), this, SLOT(update()));
     m_viewer = nullptr;
diff --git a/toonz/sources/toonz/frameheadgadget.cpp b/toonz/sources/toonz/frameheadgadget.cpp
index ce59878..b0400da 100644
--- a/toonz/sources/toonz/frameheadgadget.cpp
+++ b/toonz/sources/toonz/frameheadgadget.cpp
@@ -600,6 +600,7 @@ void FilmstripFrameHeadGadget::drawShiftTraceMarker(QPainter &p) {
 //-----------------------------------------------------------------------------
 
 bool FilmstripFrameHeadGadget::eventFilter(QObject *obj, QEvent *e) {
+  if (e->type() != QEvent::MouseButtonPress && e->type() != QEvent::MouseButtonDblClick && e->type() != QEvent::MouseMove) return false;
   // shift & trace case
   if (CommandManager::instance()->getAction(MI_ShiftTrace)->isChecked())
     return shiftTraceEventFilter(obj, e);