From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tang Ling <ling.java@gmail.com>
Subject: Re: Bug: fatal when opening agenda [8.2.5h
 (8.2.5h-82-gd91d4b-elpaplus <at> 
 /home/jeffrey/.emacs.d/elpa/org-plus-contrib-20140324/)]
Date: Fri, 11 Apr 2014 04:54:02 +0000 (UTC)
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Jeffrey DeLeo <jeffreydeleo <at> gmail.com> writes:

> 
> 
> Remember to cover the basics, that is, what you expected to happen 
and
> what in fact did happen.  You don't know how to make a good report?  
See
> 
>      http://orgmode.org/manual/Feedback.html#Feedback
> 
> Your bug report will be posted to the Org-mode mailing list.
> ------------------------------------------------------------------------
> 
> Trying to use the org-agenda gives fatal error.
> (org-agenda) then hit 'a' or 't'
> 
> Stack trace:
> 
> (wrong-type-argument integer-or-marker-p nil)
>   put-text-property(101818 nil org-effort "0:30")
>   (save-excursion (org-back-to-heading t) (put-text-property (point-at-
bol)
> (outline-next-heading) tprop p))
>   (while (re-search-forward (concat "^[ 	]*:" dprop ": +\\(.*\\)[ 	]*$") 

Found solution of this bug.
Due to the (outline-next-heading) method return nil value when current 
heading is the last heading in document. So it cannot work correctly 
during invoke (put-text-properties)

Temporary solution:
1. Add new headline at the end of org-mode document, like this:
* TODO hello
  :PROPERTIES:
  :Effort:   0:10
  :END:
* duplicated headline

2. Modify the source code of org-mode and then re-compile it.
This need to modify the method (org-refresh-properties) in org.el
change the following line:
(put-text-property
	      (point-at-bol) (outline-next-heading) tprop p)
to:
	     (put-text-property
	      (point-at-bol) (or (outline-next-heading)
                                 (point-max)) tprop p)

Hope it works.