On Thu, Mar 17 2011, Nick Dokos wrote:

> I can reproduce it just by setting org-agenda-include-diary to t
> (Org-mode version 7.5 (release_7.5.60.g706a.dirty))

Well, I can't. :(

> x is the St.Patrick's Day entry: #(" Diary: St. Patrick's Day" 0 2
> (org-category #5="diary" tags nil org-highest-priority 65
> org-lowest-priority 67 time-of-day nil duration nil effort nil
> effort-minutes nil txt #4=#("St. Patrick's Day" 0 17 (org-heading t)) time
> #1="" extra #1# dotime time org-heading t type #3="diary" date #2=(3 17
> 2011) face org-todo) 2 14 (org-category #5# tags nil org-highest-priority 65
> org-lowest-priority 67 time-of-day nil duration nil effort nil
> effort-minutes nil txt #4# time #1# extra #1# dotime time org-heading t type
> #3# date #2# face org-agenda-diary) 14 31 (org-heading t org-category #5#
> tags nil org-highest-priority 65 org-lowest-priority 67 time-of-day nil
> duration nil effort nil effort-minutes nil txt #4# time #1# extra #1# dotime
> time type #3# date #2# face org-agenda-diary))
>
> re is the empty string so indeed it is not nil: ""

Well, I do not see how re can be "" since:
	(setq re (get-text-property 0 'org-todo-regexp x))

And x has no 'org-todo-regexp property.

Since you seems familiar with the debugger, could you try to see what's
happening?

-- 
Julien Danjou
❱ http://julien.danjou.info