diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 39e2c7603b..4ac089ebcc 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -2460,8 +2460,6 @@ void wxWindowGTK::ConnectWidget( GtkWidget *widget )
 
 bool wxWindowGTK::Destroy()
 {
-    wxASSERT_MSG( (m_widget != NULL), wxT("invalid window") );
-
     m_hasVMT = false;
 
     return wxWindowBase::Destroy();