Prevent Gtk-CRITICAL assertion when the application is closed with a Track Property...

diff --git a/src/viktrack.c b/src/viktrack.c
index f5309cce3020b707c2bf36a9250e32badb1a8eda..e5d6fd47e84e92ac1fdac932a21337fa70b981cb 100644 (file)
--- a/src/viktrack.c
+++ b/src/viktrack.c
@@ -90,7 +90,8 @@ void vik_track_free(VikTrack *tr)
   g_list_foreach ( tr->trackpoints, (GFunc) g_free, NULL );
   g_list_free( tr->trackpoints );
   if (tr->property_dialog)
-    gtk_widget_destroy ( GTK_WIDGET(tr->property_dialog) );
+    if ( GTK_IS_WIDGET(tr->property_dialog) )
+      gtk_widget_destroy ( GTK_WIDGET(tr->property_dialog) );
   g_free ( tr );
 }