Use case is call dot babel from elisp code block. refer to http://orgmode.org/worg/org-tutorials/org-dot-diagrams.html Below is a more minimal example: #+NAME: nodes | From | To | Weight | |------+----+--------| | A | B | 3 | | A | C | 2 | | B | D | 4 | | B | E | 5 | | C | F | 10 | #+BEGIN_SRC elisp :file a.png :var nodes=nodes (defun rowfun(x) (format "%s -> %s [label=%s];" (nth 0 x) (nth 1 x) (nth 2 x)) ) (defun dotgen(nodes) (let ((dotbegin "digraph {\nnode [shape=circle]\n") (dotend "\n}")) (concat dotbegin (mapconcat #'rowfun nodes "\n") dotend))) (setq params (nth 2 (org-babel-get-src-block-info))) (org-babel-execute:dot (dotgen nodes) params) #+END_SRC If run this block with C-c C-c, it will generate a image a.png with "nil" string in it. so it's a invalid image file. The issue is introduced by below commit: 041ca4b6f ob-core: Do not return results on writing to file After revert this commit, it works fine. Sounds like this change will cause the function return "nil" string but not nil variable. Another probelm is the params variable is void in org 9.0.5. but we can replace it with (nth 2 (org-babel-get-src-block-info)) as my example code. BRs J.J. Wang In GNU Emacs 25.2.1 (x86_64-apple-darwin16.0.0, NS appkit-1504.00 Version 10.12 (Build 16A323)) of 2017-04-03 built on e12714-mac01 Windowing system distributor 'Apple', version 10.3.1504 Configured using: 'configure --disable-dependency-tracking --disable-silent-rules --enable-locallisppath=/usr/local/share/emacs/site-lisp --infodir=/usr/local/Cellar/emacs/25.2-rc2/share/info/emacs --prefix=/usr/local/Cellar/emacs/25.2-rc2 --without-x --with-xml2 --with-dbus --with-gnutls --with-imagemagick --with-rsvg --without-pop --with-ns --disable-ns-self-contained' Configured features: JPEG RSVG IMAGEMAGICK DBUS NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS Important settings: value of $LC_CTYPE: en_US.UTF-8 value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Org Minor modes in effect: diff-auto-refine-mode: t org-indent-mode: t helm-mode: t shell-dirtrack-mode: t async-bytecomp-package-mode: t yas-global-mode: t yas-minor-mode: t global-company-mode: t company-mode: t override-global-mode: t show-paren-mode: t tooltip-mode: t global-eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t auto-fill-function: yas--auto-fill transient-mark-mode: t Recent messages: Code block evaluation complete. Edebug: org-babel-result-cond org-babel-result-cond executing Elisp code block... (nodes (quote (("A" "B" 3) ("A" "C" 2) ("B" "D" 4) ("B" "E" 5) ("C" "F" 10)))) Wrote /var/folders/r0/58rd7gbs3pz3gsj48zdv8pwn00n31m/T/babel-30327L5l/ob-input-30327wiQ Code block evaluation complete. 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org-rmail org-mhe org-irc org-info org-gnus org-docview doc-view jka-compr image-mode org-bibtex bibtex org-bbdb org-w3m company-oddmuse company-keywords company-etags etags xref project company-gtags company-dabbrev-code company-dabbrev company-files company-capf company-cmake company-xcode company-clang company-semantic company-eclim company-template company-css company-nxml company-bbdb ob-latex ob-C cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs ob-calc calc-store calc-trail calc-ext calc calc-loaddefs calc-macs ob-dot ob-plantuml ob-python org-crypt ox-gfm ox-md ox-odt rng-loc rng-uri rng-parse rng-match rng-dt rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex ox-icalendar ox-html table ox-ascii ox-publish ox org-element avl-tree org org-macro org-footnote org-pcomplete org-list org-faces org-entities noutline outline org-version ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval org-compat org-macs org-loaddefs find-func cal-menu calendar cal-loaddefs setup-helm-gtags helm-gtags subr-x pulse which-func imenu setup-helm helm-projectile projectile grep ibuf-ext ibuffer helm-mode helm-files rx image-dired tramp tramp-compat tramp-loaddefs trampver shell pcomplete format-spec dired-x dired-aux ffap thingatpt helm-buffers helm-elscreen helm-tags helm-bookmark helm-adaptive helm-info bookmark pp helm-locate helm-external helm-net browse-url xml url url-proxy url-privacy url-expand url-methods url-history url-cookie url-domsuf url-util url-parse auth-source gnus-util mm-util help-fns mail-prsvr password-cache url-vars mailcap helm-types helm-grep helm-regexp helm-utils compile comint ansi-color ring helm-help helm helm-source eieio-compat eieio eieio-core helm-multi-match helm-config helm-easymenu cl-macs async-bytecomp advice async helm-lib dired cl-seq yasnippet init-company-mode lazy-set-key company use-package diminish bind-key easy-mmode paren manoj-dark-theme misterioso-theme edmacro kmacro finder-inf info package epg-config seq byte-opt gv bytecomp byte-compile cl-extra help-mode easymenu cconv cl-loaddefs pcase cl-lib time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel ns-win ucs-normalize term/common-win tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese charscript case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote dbusbind kqueue cocoa ns multi-tty make-network-process emacs) Memory information: ((conses 16 550219 22768) (symbols 48 48191 0) (miscs 40 216 1037) (strings 32 125351 17559) (string-bytes 1 3803442) (vectors 16 73192) (vector-slots 8 1151281 9870) (floats 8 921 370) (intervals 56 1485 323) (buffers 976 25))