diff --git a/WINGs/wwindow.c b/WINGs/wwindow.c
index 9e3bddb..9b816a6 100644
--- a/WINGs/wwindow.c
+++ b/WINGs/wwindow.c
@@ -417,6 +417,9 @@ static void realizeWindow(WMWindow * win)
 	Atom atoms[4];
 	int count;
 
+	if (!scr->display)
+		return;
+
 	classHint = XAllocClassHint();
 	classHint->res_name = win->wname;
 	classHint->res_class = WMGetApplicationName();