1 files changed, 3 insertions, 1 deletions
diff --git a/src/widgets/widgets/qmdisubwindow.cpp b/src/widgets/widgets/qmdisubwindow.cpp
index c3b31ea5a4..7129c2ff44 100644
--- a/src/widgets/widgets/qmdisubwindow.cpp
+++ b/src/widgets/widgets/qmdisubwindow.cpp
@@ -1000,7 +1000,9 @@ void QMdiSubWindowPrivate::removeBaseWidget()
         q->setWindowModified(false);
     }
     lastChildWindowTitle.clear();
-    baseWidget->setParent(0);
+    // QTBUG-47993: parent widget can be reset before this call
+    if (baseWidget->parentWidget() == q)
+        baseWidget->setParent(0);
     baseWidget = 0;
     isWidgetHiddenByUs = false;
 }