diff --git a/effects/fallapart/fallapart.cpp b/effects/fallapart/fallapart.cpp
index 5e08fd971d..df623fb836 100644
--- a/effects/fallapart/fallapart.cpp
+++ b/effects/fallapart/fallapart.cpp
@@ -163,6 +163,9 @@ void FallApartEffect::slotWindowClosed(EffectWindow* c)
         return;
     if (!c->isVisible())
         return;
+    const void* e = c->data(WindowClosedGrabRole).value<void*>();
+    if (e && e != this)
+        return;
     c->setData(WindowClosedGrabRole, QVariant::fromValue(static_cast<void*>(this)));
     windows[ c ] = 0;
     c->refWindow();