2 files changed, 5 insertions, 1 deletions
diff --git a/ChangeLog b/ChangeLog
index 19e56dd89..5f4635a98 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Nov  1 11:46:19 2004  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* process.c (rb_f_exec): should check whether prog is NULL.
+
 Mon Nov  1 09:37:19 2004  Kouhei Sutou  <kou@cozmixng.org>
 
 	* lib/rss/maker.rb: added entry point of RSS Maker.
diff --git a/process.c b/process.c
index bdf651f37..1ed5dd935 100644
--- a/process.c
+++ b/process.c
@@ -1267,7 +1267,7 @@ rb_f_exec(argc, argv)
     else {
 	e.argc = argc;
 	e.argv = argv;
-	e.prog = RSTRING(prog)->ptr;
+	e.prog = prog ? RSTRING(prog)->ptr : 0;
     }
     rb_exec(&e);
     rb_sys_fail(e.prog);