diff --git a/ui/ozone/platform/x11/x11_window.cc b/ui/ozone/platform/x11/x11_window.cc
index 70f25eaa3d605..4744f19b87575 100644
--- a/ui/ozone/platform/x11/x11_window.cc
+++ b/ui/ozone/platform/x11/x11_window.cc
@@ -1469,13 +1469,22 @@ void X11Window::DispatchUiEvent(ui::Event* event, const x11::Event& xev) {
       // event's location and dispatch to the other.
       const gfx::Point target_origin =
           located_events_grabber->GetBoundsInPixels().origin();
+      // GetBoundsInPixels() may dispatch X server replies synchronously and
+      // run OnBoundsChanged on the grabber, which can destroy either `this`
+      // or the grabber. Re-check both.
       if (!weak_this) {
         return;
       }
+      if (window_manager->located_events_grabber() != located_events_grabber) {
+        return;
+      }
       const gfx::Point current_origin = GetBoundsInPixels().origin();
       if (!weak_this) {
         return;
       }
+      if (window_manager->located_events_grabber() != located_events_grabber) {
+        return;
+      }
       ConvertEventLocationToTargetWindowLocation(target_origin, current_origin,
                                                  event->AsLocatedEvent());
     }