diff --git a/ui/ozone/platform/wayland/host/wayland_popup.cc b/ui/ozone/platform/wayland/host/wayland_popup.cc
index c19d680a1ae84..cde6259e25461 100644
--- a/ui/ozone/platform/wayland/host/wayland_popup.cc
+++ b/ui/ozone/platform/wayland/host/wayland_popup.cc
@@ -180,7 +180,16 @@ void WaylandPopup::SetBoundsInDIP(const gfx::Rect& bounds_dip) {
   }
 
   auto old_bounds_dip = GetBoundsInDIP();
+  // WaylandWindow::SetBoundsInDIP() synchronously dispatches
+  // delegate()->OnStateUpdate(), which may delete |this| (e.g. an observer
+  // closes the popup during its own bounds-change notification). Guard with a
+  // weak pointer, mirroring MaybeApplyLatestStateRequest() and the sibling
+  // HeadlessWindow backend.
+  auto weak_this = weak_ptr_factory_.GetWeakPtr();
   WaylandWindow::SetBoundsInDIP(bounds_dip);
+  if (!weak_this) {
+    return;
+  }
 
   // The shell popup can be null if bounds are being fixed during
   // the initialization. See WaylandPopup::CreateShellPopup.