--- gdl-0.9rc4/src/basic_pro.cpp.wx	2010-07-07 15:40:39.000000000 -0600
+++ gdl-0.9rc4/src/basic_pro.cpp	2010-07-07 15:41:48.498004077 -0600
@@ -728,7 +728,7 @@
 #endif
 
 #ifdef HAVE_LIBWXWIDGETS
-    wxTheApp->OnExit(); // Defined in GDLApp::OnExit() in gdlwidget.cpp
+    if (wxTheApp) wxTheApp->OnExit(); // Defined in GDLApp::OnExit() in gdlwidget.cpp
 //     wxUninitialize();
 #endif