From: Chong Yidong <cyd@gnu.org>
Date: Sat, 28 Jan 2012 02:01:05 +0000 (+0800)
Subject: * mail/rmail.el (rmail-mail-return): Only switch to live buffers.
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* mail/rmail.el (rmail-mail-return): Only switch to live buffers.
---

diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index 813912f2e9b..7d4c7c15447 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -3620,7 +3620,7 @@ to switch to."
       (cond ((null rmail-flag)
 	     ;; If the Rmail buffer is not in the next window, switch
 	     ;; directly to the Rmail buffer specified by NEWBUF.
-	     (if newbuf
+	     (if (buffer-live-p newbuf)
 		 (switch-to-buffer newbuf)))
 	    ;; If the Rmail buffer is in the next window, switch to
 	    ;; the summary buffer if `mail-bury-selects-summary' is