diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 5bfdea07dc..563df3245a 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -10060,6 +10060,12 @@ void GLCanvas3D::_set_warning_notification_if_needed(EWarning warning)
 
 void GLCanvas3D::_set_warning_notification(EWarning warning, bool state)
 {
+    // On app quit the Plater pImpl (p) is freed before its child GLCanvas3D windows are
+    // destroyed; reset_volumes() -> _set_warning_notification() -> get_notification_manager()
+    // would then dereference the freed p (use-after-free crash on exit). No warning
+    // notifications are needed while the app is closing.
+    if (wxGetApp().is_closing())
+        return;
     using NotificationLevel = NotificationManager::NotificationLevel;
     enum ErrorType{
         PLATER_WARNING,
diff --git a/src/slic3r/GUI/Selection.cpp b/src/slic3r/GUI/Selection.cpp
index 8452b8222c..7521334956 100644
--- a/src/slic3r/GUI/Selection.cpp
+++ b/src/slic3r/GUI/Selection.cpp
@@ -760,6 +760,12 @@ void Selection::clear()
 #endif
 
     // #et_FIXME fake KillFocus from sidebar
+    // On app quit the Plater's child GLCanvas3D windows are destroyed by the wxWindow
+    // base destructor *after* Plater's pImpl (p) has already been freed. reset_volumes()
+    // -> Selection::clear() then reaches back into plater()->canvas3D(), a use-after-free
+    // that crashes on exit. This is a UI-only redraw hint, so skip it while closing.
+    if (wxGetApp().is_closing())
+        return;
     wxGetApp().plater()->canvas3D()->handle_sidebar_focus_event("", false);
 }