--- rxvt-unicode/src/init.C	2005/02/17 15:07:48	1.110
+++ rxvt-unicode/src/init.C	2005/02/17 20:52:48	1.111
@@ -978,10 +978,12 @@
 #if ENABLE_FRILLS
   if (rs[Rs_embed])
     {
+      XWindowAttributes wattr;
+
       top = strtol (rs[Rs_embed], 0, 0);
 
-      XWindowAttributes wattr;
-      XGetWindowAttributes (disp, top, &wattr);
+      if (!XGetWindowAttributes (disp, top, &wattr))
+        rxvt_fatal ("invalid window-id specified with -embed, aborting.\n");
 
       window_calc (wattr.width, wattr.height);