21.4.14 crash during message sending via message.

Fatal error.

Your files have been auto-saved.
Use `M-x recover-session' to recover them.

Your version of XEmacs was distributed with a PROBLEMS file that  may describe
your crash, and with luck a workaround.  Please check it first, but do report
the crash anyway.  Please report this bug by invoking M-x report-emacs-bug,
or by selecting `Send Bug Report' from the Help menu.  If necessary, send
ordinary email to `crashes@xemacs.org'.  *MAKE SURE* to include the XEmacs
configuration from M-x describe-installation, or equivalently the file
Installation in the top of the build tree.

Lisp backtrace follows:

  add-spec-list-to-specifier(#<boolean-specifier global=<unspecified> fallback=(
(nil . t)) 0x16f> ((#<window on "*Summary nnml:xemacs-beta*" 0x3b230> (nil . t))
) nil)
  # bind (is-valid nval how-to-add tag-set locale value specifier)
  set-specifier(#<boolean-specifier global=<unspecified> fallback=((nil . t)) 0x
16f> t #<window on "*Summary nnml:xemacs-beta*" 0x3b230>)
  # bind (inhibit-quit window)
  blink-cursor-post-command-hook()
  # (condition-case ... . error)
  # (condition-case ... . error)
  # (catch top-level ...)