From mboxrd@z Thu Jan  1 00:00:00 1970
From: Nicolas Goaziou <mail@nicolasgoaziou.fr>
Subject: Re: org-mobile-push breaks currently open org-agenda
Date: Fri, 10 Mar 2017 18:28:17 +0100
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To: Aaron Jensen <aaronjensen@gmail.com>
Cc: emacs-orgmode@gnu.org

Aaron Jensen <aaronjensen@gmail.com> writes:

> Thank you for the tip. Here is the trace:
>
> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>   set-buffer(nil)
>   (save-current-buffer (set-buffer buffer) buffer-undo-list)
>   (let ((--cline (org-current-line)) (--cmd this-command) (--buf1
> (current-buffer)) (--buf2 buffer) (--undo1 buffer-undo-list) (--undo2
> (save-current-buffer (set-buffer buffer) buffer-undo-list)) --c1 --c2)
> (save-current-buffer (set-buffer buffer) (widen) (goto-char pos)
> (org-show-context (quote agenda)) (let ((current-prefix-arg arg))
> (call-interactively (quote org-todo))) (and (bolp) (forward-char 1))
> (setq newhead (org-get-heading)) (if (and (and (boundp (quote
> org-agenda-headline-snapshot-before-repeat))

It seems that the buffer containing the headline you're calling
`org-todo' on doesn't exist anymore. 

ATM, I am not sure how it happens since the headline was extracted from
some document. Could you try evaluating 

  M-: (org-get-at-bol 'org-marker)

on a problematic line and report back the problem?

Better, do you have any ECM for the problem?

Regards,