diff --git a/ChangeLog b/ChangeLog
index f4c5484c..da8f3dad 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2010-05-08  Tadashi MATSUO  <tad@mymail.twin.jp>
+
+	* twittering-mode.el (twittering-jojo-mode-p): confirm that the
+	buffer has not been killed.
+
 2010-05-06  Tadashi MATSUO  <tad@mymail.twin.jp>
 
 	* twittering-mode.el: Fix the format specifier "%r" for direct
diff --git a/twittering-mode.el b/twittering-mode.el
index 7e5e4fe3..9040f67f 100644
--- a/twittering-mode.el
+++ b/twittering-mode.el
@@ -4226,9 +4226,10 @@ variable `twittering-status-format'."
       (twittering-update-mode-line))))
 
 (defun twittering-jojo-mode-p (spec)
-  (with-current-buffer
-      (twittering-get-buffer-from-spec spec)
-    twittering-jojo-mode))
+  (let ((buffer (twittering-get-buffer-from-spec spec)))
+    (when (buffer-live-p buffer)
+      (with-current-buffer buffer
+	twittering-jojo-mode))))
 
 (defun twittering-toggle-reverse-mode (&optional arg)
   (interactive "P")