refs)
;; If the References field has been changed, we make it
;; visible in the header.
- (mail-header-set-message-id message-reply-headers nil)
- (mail-header-set-references message-reply-headers nil)
+ (when message-reply-headers
+ (mail-header-set-message-id message-reply-headers nil)
+ (mail-header-set-references message-reply-headers nil))
(widen)
(message-narrow-to-headers)
(if (let ((case-fold-search t))