diff --git a/src/plugins/qmldesigner/designmodewidget.cpp b/src/plugins/qmldesigner/designmodewidget.cpp
index 460b613b26b..bc566f4f756 100644
--- a/src/plugins/qmldesigner/designmodewidget.cpp
+++ b/src/plugins/qmldesigner/designmodewidget.cpp
@@ -582,6 +582,9 @@ void DesignModeWidget::setMinimumSizeHintFromContentMinimumSize(bool value)
 
     m_minimumSizeHintMode = newMode;
 
+    if (!m_dockManager)
+        return;
+
     const auto &dockWidgets = m_dockManager->dockWidgetsMap();
     for (auto dockWidget : dockWidgets)
         dockWidget->setMinimumSizeHintMode(m_minimumSizeHintMode);