1.1 --- a/src/gtkui/mmio_win.c	Tue Jan 01 05:48:06 2008 +0000
     1.2 +++ b/src/gtkui/mmio_win.c	Tue Jan 01 05:51:04 2008 +0000
     1.3 @@ -121,8 +121,10 @@
     1.4      gtk_container_add( GTK_CONTAINER(vbox), GTK_WIDGET(scroll) );
     1.5  
     1.6      trace_button = GTK_CHECK_BUTTON(gtk_check_button_new_with_label(_("Trace access")));
     1.7 -    gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(trace_button), 
     1.8 -				 io_rgn->trace_flag ? TRUE : FALSE);
     1.9 +    if( io_rgn != NULL ) {
    1.10 +	gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(trace_button), 
    1.11 +				     io_rgn->trace_flag ? TRUE : FALSE);
    1.12 +    }
    1.13      gtk_container_add( GTK_CONTAINER(vbox), GTK_WIDGET(trace_button) );
    1.14      gtk_box_set_child_packing( GTK_BOX(vbox), GTK_WIDGET(trace_button), 
    1.15  			       FALSE, FALSE, 0, GTK_PACK_START );