diff --git a/ChangeLog b/ChangeLog
index 5a8a1134e..2af07c40a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2005-01-31  Mike Kestner  <mkestner@novell.com>
+
+	* gtk/Dialog.custom : null check a parent arg.  [Fixes #77400]
+
 2005-01-22  Mike Kestner  <mkestner@novell.com>
 
 	* configure.in.in : work around broken vte that doesn't
diff --git a/gtk/Dialog.custom b/gtk/Dialog.custom
index 2b20389fa..dacf353f7 100644
--- a/gtk/Dialog.custom
+++ b/gtk/Dialog.custom
@@ -43,7 +43,7 @@ public Dialog (string title, Gtk.Window parent, Gtk.DialogFlags flags, params ob
 			HasSeparator = false;
 	} else {
 		IntPtr native = GLib.Marshaller.StringToPtrGStrdup (title);
-		Raw = gtk_dialog_new_with_buttons (native, parent.Handle, (int) flags, IntPtr.Zero);
+		Raw = gtk_dialog_new_with_buttons (native, parent == null ? IntPtr.Zero : parent.Handle, (int) flags, IntPtr.Zero);
 		GLib.Marshaller.Free (native);
 	}