(defun notmuch-start-notmuch-sentinel (proc event)
"Process sentinel function used by `notmuch-start-notmuch'."
(let* ((err-buffer (process-get proc 'err-buffer))
- (err (and (not (zerop (buffer-size err-buffer)))
+ (err (and (buffer-live-p err-buffer)
+ (not (zerop (buffer-size err-buffer)))
(with-current-buffer err-buffer (buffer-string))))
(sub-sentinel (process-get proc 'sub-sentinel))
(real-command (process-get proc 'real-command)))