bug#5059: gnus error message

in gnus, pressing space on an article title, gets into the article,but also gives an error message.  here is the traceback
Debugger entered--Lisp error: (error "Invalid search bound (wrong side of point)")  re-search-forward("^\\([ 	]*[-a-z0-9A-Z]*>+[ 	]*\\|[ 	]*\\)" 1186 t)  gnus-cite-parse()  gnus-cite-parse-wrapper()  gnus-cite-parse-maybe(nil)  gnus-article-highlight-citation()  gnus-treat-article(nil 1 1)  gnus-display-mime()  gnus-article-prepare-display()  gnus-article-prepare(8146 nil)  gnus-summary-display-article(8146)  gnus-summary-next-page(nil)  call-interactively(gnus-summary-next-page nil nil)

If Emacs crashed, and you have the Emacs process in the gdb debugger,please include the output from the following gdb commands:    `bt full' and `xbacktrace'.For information about debugging Emacs, please read the file/usr/local/emacs/nextstep/Emacs.app/Contents/Resources/etc/DEBUG.

In GNU Emacs 23.1.50.12 (i386-apple-darwin9.8.0, NS apple-appkit-949.54) of 2009-11-27 on wsp031989wssWindowing system distributor `Apple', version 10.3.949configured using `configure  '--with-ns' '--without-x''
Important settings:  value of $LC_ALL: nil  value of $LC_COLLATE: C  value of $LC_CTYPE: nil  value of $LC_MESSAGES: nil  value of $LC_MONETARY: nil  value of $LC_NUMERIC: nil  value of $LC_TIME: nil  value of $LANG: nil  value of $XMODIFIERS: nil  locale-coding-system: nil  default enable-multibyte-characters: t
Major mode: EShell
Minor modes in effect:  delete-selection-mode: t  display-time-mode: t  auto-image-file-mode: t  shell-dirtrack-mode: t  tooltip-mode: t  mouse-wheel-mode: t  tool-bar-mode: t  menu-bar-mode: t  file-name-shadow-mode: t  global-font-lock-mode: t  font-lock-mode: t  blink-cursor-mode: t  global-auto-composition-mode: t  auto-composition-mode: t  auto-encryption-mode: t  auto-compression-mode: t  column-number-mode: t  line-number-mode: t  transient-mark-mode: t  abbrev-mode: t
 		 	   		  
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