Index: src/rbgnome-canvas-path-def.c
===================================================================
RCS file: /cvsroot/ruby-gnome2/ruby-gnome2/gnomecanvas/src/rbgnome-canvas-path-def.c,v
retrieving revision 1.8
diff -u -p -r1.8 rbgnome-canvas-path-def.c
--- src/rbgnome-canvas-path-def.c	15 Feb 2005 06:12:56 -0000	1.8
+++ src/rbgnome-canvas-path-def.c	29 Jul 2005 07:11:07 -0000
@@ -73,7 +73,12 @@ cpathdef_initialize(argc, argv, self)
     if (NIL_P(obj)) {
         path = gnome_canvas_path_def_new();
     } else if (TYPE(obj) == T_FIXNUM) {
-        path = gnome_canvas_path_def_new_sized(NUM2INT(obj));
+        gint length = NUM2INT(obj);
+        if (length > 0) {
+            path = gnome_canvas_path_def_new_sized(length);
+        } else {
+            rb_raise(rb_eArgError, "invalid value %d (expect > 0)", length);
+        }
     } else {
         path = gnome_canvas_path_def_new_from_bpath(get_art_bpath(obj));
     }