diff --git a/src/plugins/platforms/wayland/qwaylandwindow.cpp b/src/plugins/platforms/wayland/qwaylandwindow.cpp
index 82018a5eb0a..04c2dbd48f4 100644
--- a/src/plugins/platforms/wayland/qwaylandwindow.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwindow.cpp
@@ -547,8 +547,8 @@ void QWaylandWindow::sendRecursiveExposeEvent()
 
 void QWaylandWindow::attach(QWaylandBuffer *buffer, int x, int y)
 {
-    Q_ASSERT(!buffer->committed());
     if (buffer) {
+        Q_ASSERT(!buffer->committed());
         handleUpdate();
         buffer->setBusy();