diff --git a/LibGUI/GWindow.cpp b/LibGUI/GWindow.cpp
index 13319204e0..36dbd2fe11 100644
--- a/LibGUI/GWindow.cpp
+++ b/LibGUI/GWindow.cpp
@@ -144,9 +144,9 @@ void GWindow::set_rect(const Rect& a_rect)
     request.window_id = m_window_id;
     request.window.rect = a_rect;
     GEventLoop::current().post_message_to_server(request);
-    if (m_back_bitmap->size() != a_rect.size())
+    if (m_back_bitmap && m_back_bitmap->size() != a_rect.size())
         m_back_bitmap = nullptr;
-    if (m_front_bitmap->size() != a_rect.size())
+    if (m_front_bitmap && m_front_bitmap->size() != a_rect.size())
         m_front_bitmap = nullptr;
     if (m_main_widget)
         m_main_widget->resize(a_rect.size());