From cd09e4abd8f8ba814e093bfad9519fc7c05f03d9 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Mon, 17 Apr 2000 15:39:37 +0000
Subject: 2000-04-18

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@670 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 eval.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'eval.c')

diff --git a/eval.c b/eval.c
index 4cd3d7bf5d..fe575ceb40 100644
--- a/eval.c
+++ b/eval.c
@@ -6359,8 +6359,10 @@ thread_free(th)
     th->stk_ptr = 0;
     if (th->locals) st_free_table(th->locals);
     if (th->status != THREAD_KILLED) {
-	th->prev->next = th->next;
-	th->next->prev = th->prev;
+	if (th->prev)
+	    th->prev->next = th->next;
+	if (th->next)
+	    th->next->prev = th->prev;
     }
     if (th != main_thread) free(th);
 }
-- 
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