[PATCH] erc: check that buffer is alive in sentinel

[Julien Danjou <julien@danjou.info>]

Signed-off-by: Julien Danjou <julien@danjou.info>
---
 lisp/erc/ChangeLog      |    5 ++++
 lisp/erc/erc-backend.el |   49 ++++++++++++++++++++++++-----------------------
 2 files changed, 30 insertions(+), 24 deletions(-)

diff --git a/lisp/erc/ChangeLog b/lisp/erc/ChangeLog
index 81bdf54..3443e3b 100644
--- a/lisp/erc/ChangeLog
+++ b/lisp/erc/ChangeLog
@@ -1,3 +1,8 @@
+2010-10-23  Julien Danjou  <julien@danjou.info>
+
+	* erc-backend.el (erc-process-sentinel): Check that buffer is
+	alive before setting it as current buffer.
+
 2010-10-14  Juanma Barranquero  <lekktu@gmail.com>
 
 	* erc-xdcc.el (erc-xdcc-help-text): Fix typo in docstring.
diff --git a/lisp/erc/erc-backend.el b/lisp/erc/erc-backend.el
index 9a237d4..65d8ce1 100644
--- a/lisp/erc/erc-backend.el
+++ b/lisp/erc/erc-backend.el
@@ -653,30 +653,31 @@ Conditionally try to reconnect and take appropriate action."
 
 (defun erc-process-sentinel (cproc event)
   "Sentinel function for ERC process."
-  (with-current-buffer (process-buffer cproc)
-    (erc-log (format
-              "SENTINEL: proc: %S	 status: %S  event: %S (quitting: %S)"
-              cproc (process-status cproc) event erc-server-quitting))
-    (if (string-match "^open" event)
-        ;; newly opened connection (no wait)
-        (erc-login)
-      ;; assume event is 'failed
-      (let ((buf (process-buffer cproc)))
-        (erc-with-all-buffers-of-server cproc nil
-                                        (setq erc-server-connected nil))
-        (when erc-server-ping-handler
-          (progn (erc-cancel-timer erc-server-ping-handler)
-                 (setq erc-server-ping-handler nil)))
-        (run-hook-with-args 'erc-disconnected-hook
-                            (erc-current-nick) (system-name) "")
-        ;; Remove the prompt
-        (goto-char (or (marker-position erc-input-marker) (point-max)))
-        (forward-line 0)
-        (erc-remove-text-properties-region (point) (point-max))
-        (delete-region (point) (point-max))
-        ;; Decide what to do with the buffer
-        ;; Restart if disconnected
-        (erc-process-sentinel-1 event buf)))))
+  (let ((buf (process-buffer cproc)))
+    (when (buffer-live-p buf)
+      (with-current-buffer buf
+        (erc-log (format
+                  "SENTINEL: proc: %S	 status: %S  event: %S (quitting: %S)"
+                  cproc (process-status cproc) event erc-server-quitting))
+        (if (string-match "^open" event)
+            ;; newly opened connection (no wait)
+            (erc-login)
+          ;; assume event is 'failed
+          (erc-with-all-buffers-of-server cproc nil
+                                          (setq erc-server-connected nil))
+          (when erc-server-ping-handler
+            (progn (erc-cancel-timer erc-server-ping-handler)
+                   (setq erc-server-ping-handler nil)))
+          (run-hook-with-args 'erc-disconnected-hook
+                              (erc-current-nick) (system-name) "")
+          ;; Remove the prompt
+          (goto-char (or (marker-position erc-input-marker) (point-max)))
+          (forward-line 0)
+          (erc-remove-text-properties-region (point) (point-max))
+          (delete-region (point) (point-max))
+          ;; Decide what to do with the buffer
+          ;; Restart if disconnected
+          (erc-process-sentinel-1 event buf))))))
 
 ;;;; Sending messages
 
-- 
1.7.2.3