From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric S Fraga <e.fraga@ucl.ac.uk>
Subject: [bug] org-agenda view fails if I have missed a deadline
Date: Mon, 30 Nov 2015 08:41:33 +0000
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(posted this to gnus mailing list by mistake... sigh)

Hello,

with org up to date as of a minute ago, if I try to view my current
agenda, which happens to have an entry that has missed its deadline
(i.e. the deadline is in the past), org fails with an error:

--8<---------------cut here---------------start------------->8---
Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  format(nil 1)
  (cond ((> diff 0) (format future diff)) ((string= future past) (format past diff)) (t (format past (abs diff))))
  (let ((future (nth 1 org-agenda-deadline-leaders)) (past (nth 2 org-agenda-deadline-leaders))) (cond ((> diff 0) (format future diff)) ((string= future past) (format past diff)) (t (format past (abs diff)))))
  (if (= diff 0) (car org-agenda-deadline-leaders) (let ((future (nth 1 org-agenda-deadline-leaders)) (past (nth 2 org-agenda-deadline-leaders))) (cond ((> diff 0) (format future diff)) ((string= future past) (format past diff)) (t (format past (abs diff))))))
  (let ((diff (if (< (org-today) current) diff (- deadline current)))) (if (= diff 0) (car org-agenda-deadline-leaders) (let ((future (nth 1 org-agenda-deadline-leaders)) (past (nth 2 org-agenda-deadline-leaders))) (cond ((> diff 0) (format future diff)) ((string= future past) (format past diff)) (t (format past (abs diff)))))))
  (org-agenda-format-item (let ((diff (if (< (org-today) current) diff (- deadline current)))) (if (= diff 0) (car org-agenda-deadline-leaders) (let ((future (nth 1 org-agenda-deadline-leaders)) (past (nth 2 org-agenda-deadline-leaders))) (cond ((> diff 0) (format future diff)) ((string= future past) (format past diff)) (t (format past (abs diff))))))) head level category tags (and (= diff 0) timestr)) 
--8<---------------cut here---------------end--------------->8---

Changing the deadline in the offending entry allows the agenda to be
shown.

Thanks,
eric

-- 
: Eric S Fraga (0xFFFCF67D), Emacs 25.0.50.2, Org release_8.3beta-816-gae83b3