diff --git a/imgui.cpp b/imgui.cpp
index 3e17a387..614016bb 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -14979,7 +14979,8 @@ static void ImGui::DockNodeUpdate(ImGuiDockNode* node)
         if (central_node_hole && !hole_rect.IsInverted())
         {
             SetWindowHitTestHole(host_window, hole_rect.Min, hole_rect.Max - hole_rect.Min);
-            SetWindowHitTestHole(host_window->ParentWindow, hole_rect.Min, hole_rect.Max - hole_rect.Min);
+            if (host_window->ParentWindow)
+                SetWindowHitTestHole(host_window->ParentWindow, hole_rect.Min, hole_rect.Max - hole_rect.Min);
         }
     }