fix(VMenu): check if element still exists before closing parent (#20249)

fixes #20248

Author: Arinono

packages/vuetify/src/components/VMenu/VMenu.tsx

@@ -78,7 +78,7 @@ export const VMenu = genericComponent<OverlaySlots>()({
         setTimeout(() => {
           if (!openChildren.value &&
             !props.persistent &&
-            (e == null || (e && !isClickInsideElement(e, overlay.value!.contentEl!)))
+            (e == null || (overlay.value?.contentEl && !isClickInsideElement(e, overlay.value.contentEl)))
           ) {
             isActive.value = false
             parent?.closeParents()