Debugger entered--Lisp error: (void-function nil)
  nil((#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil))
  apply(nil (#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil) nil)
  (cond ((functionp func) (funcall func handle)) (t (apply (car func) handle (cdr func))))
  (let* ((func mm-text-html-renderer) (entry (assq func mm-text-html-renderer-alist)) (inhibit-read-only t)) (if entry (setq func (cdr entry))) (cond ((functionp func) (funcall func handle)) (t (apply (car func) handle (cdr func)))))
  (if (stringp (car handle)) (mapcar 'mm-inline-text-html (cdr handle)) (let* ((func mm-text-html-renderer) (entry (assq func mm-text-html-renderer-alist)) (inhibit-read-only t)) (if entry (setq func (cdr entry))) (cond ((functionp func) (funcall func handle)) (t (apply (car func) handle (cdr func))))))
  mm-inline-text-html((#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil))
  mm-display-inline((#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil))
  gnus-mime-display-single((#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil))
  gnus-mime-display-part((#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil))
  gnus-mime-display-part((#("multipart/related" 0 17 (boundary "----=_Part_3611803_15130720.1521495438553" buffer #<buffer  *mm*-582300> from "foo@bar.com" start nil)) (#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil) (#<buffer  *mm*-743752> ("image/jpeg" (name . "barcode_2F72GF.jpg")) base64 nil ("attachment" (filename . "barcode_2F72GF.jpg")) nil nil "<barcode_2F72GF.jpg>")))
  gnus-display-mime((#("multipart/related" 0 17 (boundary "----=_Part_3611803_15130720.1521495438553" buffer #<buffer  *mm*-582300> from "foo@bar.com" start nil)) (#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil) (#<buffer  *mm*-743752> ("image/jpeg" (name . "barcode_2F72GF.jpg")) base64 nil ("attachment" (filename . "barcode_2F72GF.jpg")) nil nil "<barcode_2F72GF.jpg>")))
  gnus-mime-display-alternative(((#<buffer  *mm*-616996> ("text/plain" (charset . "us-ascii")) 7bit nil ("inline") nil nil nil) (#("multipart/related" 0 17 (boundary "----=_Part_3611803_15130720.1521495438553" buffer #<buffer  *mm*-582300> from "foo@bar.com" start nil)) (#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil) (#<buffer  *mm*-743752> ("image/jpeg" (name . "barcode_2F72GF.jpg")) base64 nil ("attachment" (filename . "barcode_2F72GF.jpg")) nil nil "<barcode_2F72GF.jpg>"))) nil nil 1)
  gnus-mime-display-part((#("multipart/alternative" 0 21 (boundary "----=_Part_3611802_12201241.1521495438553" buffer #<buffer  *mm*-774885> from "foo@bar.com" start nil)) (#<buffer  *mm*-616996> ("text/plain" (charset . "us-ascii")) 7bit nil ("inline") nil nil nil) (#("multipart/related" 0 17 (boundary "----=_Part_3611803_15130720.1521495438553" buffer #<buffer  *mm*-582300> from "foo@bar.com" start nil)) (#<buffer  *mm*-901610> ("text/html" (charset . "us-ascii")) 7bit nil nil nil nil nil) (#<buffer  *mm*-743752> ("image/jpeg" (name . "barcode_2F72GF.jpg")) base64 nil ("attachment" (filename . "barcode_2F72GF.jpg")) nil nil "<barcode_2F72GF.jpg>"))))
  gnus-display-mime()
  gnus-article-prepare-display()
  gnus-article-prepare(62 nil)
  gnus-summary-display-article(62 nil)
  gnus-summary-select-article(nil nil pseudo)
  gnus-summary-scroll-up(1)
  funcall-interactively(gnus-summary-scroll-up 1)
  call-interactively(gnus-summary-scroll-up nil nil)
  command-execute(gnus-summary-scroll-up)