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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@5949 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 0 deletions

diff --git a/eval.c b/eval.c
index 591e60eff4..473c53f4cc 100644
--- a/eval.c
+++ b/eval.c
@@ -11738,6 +11738,9 @@ rb_thread_raise(argc, argv, th)
 {
     volatile rb_thread_t th_save = th;
 
+    if (!th->next) {
+	rb_raise(rb_eArgError, "unstarted thread");
+    }
     if (rb_thread_dead(th)) return Qnil;
     if (curr_thread == th) {
 	rb_f_raise(argc, argv);