Hello,

The attached patch fixes an arithmetic error that occurs when calling
org-agenda on a file that contains a heading with a canceled repeater.

--
Kyle

>From 61cba7d42e19479ad3137f0f1ee01dc116d853e2 Mon Sep 17 00:00:00 2001
From: Kyle Meyer <k...@kyleam.com>
Date: Fri, 10 Jul 2015 22:34:24 -0400
Subject: [PATCH] org-closest-date: Don't accept canceled repeater

* lisp/org.el (org-time-string-to-absolute): Don't pass a canceled
  repeater to org-closest-date.
  (org-closest-date): Raise an error when passed a canceled repeater.

Prevent arith-error from occurring when a canceled repeater is passed to
org-closest-date.
---
 lisp/org.el | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lisp/org.el b/lisp/org.el
index 085b763..e1edeb1 100755
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -17564,7 +17564,8 @@ (defun org-time-string-to-absolute (s &optional daynr prefer show-all buffer pos
     (if (org-diary-sexp-entry (match-string 1 s) "" date)
 	daynr
       (+ daynr 1000)))
-   ((and daynr (string-match "\\+[0-9]+[hdwmy]" s))
+   ((and daynr (not (string-match "\\+0[hdwmy]" s))
+	 (string-match "\\+[0-9]+[hdwmy]" s))
     (org-closest-date s (if (and (boundp 'daynr) (integerp daynr)) daynr
 			  (time-to-days (current-time))) (match-string 0 s)
 			  prefer show-all))
@@ -17680,9 +17681,10 @@ (defun org-closest-date (start current change prefer show-all)
 
       (if (<= cday sday) (throw 'exit sday))
 
-      (if (string-match "\\(\\+[0-9]+\\)\\([hdwmy]\\)" change)
-	  (setq dn (string-to-number (match-string 1 change))
-		dw (cdr (assoc (match-string 2 change) a1)))
+      (when (string-match "\\(\\+[0-9]+\\)\\([hdwmy]\\)" change)
+	(setq dn (string-to-number (match-string 1 change))
+	      dw (cdr (assoc (match-string 2 change) a1))))
+      (unless (wholenump dn)
 	(user-error "Invalid change specifier: %s" change))
       (if (eq dw 'week) (setq dw 'day dn (* 7 dn)))
       (cond
-- 
2.4.5

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