This is a problem caused by my recent addition of hashing to call lines.
I've attached a patch which fixes this problem.  For some reason I am
currently unable to communicate with the Org-mode git server, so if
anyone else is able to apply this patch please do.

Thanks for catching this problem,

>From 9e0e55e0ee2c933de476ca869910c3279df62675 Mon Sep 17 00:00:00 2001
From: Eric Schulte <eric.schu...@gmx.com>
Date: Thu, 5 Jul 2012 07:47:32 -0600
Subject: [PATCH] only try to insert extant hashes

* lisp/ob-lob.el (org-babel-lob-execute): Only try to insert extant
  hashes.
---
 lisp/ob-lob.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lisp/ob-lob.el b/lisp/ob-lob.el
index 66b100c..b1efbbb 100644
--- a/lisp/ob-lob.el
+++ b/lisp/ob-lob.el
@@ -139,7 +139,7 @@ if so then run the appropriate source block from the Library."
 	  (prog1 (org-babel-execute-src-block
 		  nil (mkinfo (org-babel-process-params pre-params)))
 	    ;; update the hash
-	    (org-babel-set-current-result-hash new-hash))))))
+	    (when hash (org-babel-set-current-result-hash new-hash)))))))
 
 (provide 'ob-lob)
 
-- 
1.7.11.1

Andreas Leha <andreas.l...@med.uni-goettingen.de> writes:

> Hi all,
>
> there seems to be a bug in evaluating #+call lines.
>
> To reproduce, consider this file:
> ,----
> | * Some Headline
> | #+name: parameters
> | #+BEGIN_SRC R
> |   ttt <- 1
> | #+END_SRC
> | 
> | * Some Other Headline
> | #+call: parameters() :results silent :exports none
> `----
> and do C-c C-c on the #+call: line.
>
> For me that results in:
> ,----
> | Debugger entered--Lisp error: (wrong-type-argument stringp nil)
> |   replace-match(nil nil nil nil 3)
> |   org-babel-set-current-result-hash(nil)
> |   org-babel-lob-execute(("parameters()" ":results silent :exports none" 0))
> |   org-babel-lob-execute-maybe()
> |   org-babel-execute-maybe()
> |   org-babel-execute-safely-maybe()
> |   run-hook-with-args-until-success(org-babel-execute-safely-maybe)
> |   org-ctrl-c-ctrl-c(nil)
> |   call-interactively(org-ctrl-c-ctrl-c nil nil)
> `----
>
> Regards,
> Andreas
>
> PS: I am on emacs24.2.50.1
>
>

-- 
Eric Schulte
http://cs.unm.edu/~eschulte

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