```backtrace #0 0x00007a3b382a5751 in is_window_on_active_workspace_and_no_other_maximized_windows_above (window=0x5856402108e0) at wcktitle-title.c:65 65 while (top_window->data != window && top_window != bottom_window) { [Current thread is 1 (Thread 0x7a3b35e535c0 (LWP 890312))] gdb$ display top_window 1: top_window = 0x0 ``` Fixed by the following patch ```diff diff --git a/panel-plugin/title/wcktitle-title.c b/panel-plugin/title/wcktitle-title.c index 36179d1..172d881 100644 --- a/panel-plugin/title/wcktitle-title.c +++ b/panel-plugin/title/wcktitle-title.c @@ -62,7 +62,7 @@ static gboolean is_window_on_active_workspace_and_no_other_maximized_windows_abo windows = wnck_screen_get_windows_stacked(screen); top_window = g_list_last(windows); bottom_window = g_list_first(windows); - while (top_window->data != window && top_window != bottom_window) { + while (top_window != NULL && top_window->data != window && top_window != bottom_window) { if (wnck_window_is_maximized((Wn\kWindow *)top_window->data)) { return FALSE; } ``` probably related #19