Hello all,

I have the following setup similar to Bernt Hansen.

(setq org-tag-alist (quote ((:startgroup)
                            ("@errand" . ?e)
                            ("@office" . ?o)
                            ("@home" . ?h)
                            (:endgroup)
                            ("PHONE" . ?p)
                            ("WAITING" . ?w)
                            ("HOME" . ?H)
                            ("CANCELLED" . ?c)
                            ("NOTE" . ?n)
                            ("ORG" . ?O))))

New when I try to add a new tag with the key press "C-c C-q TAB" from a
heading, I get following backtrace.

Debugger entered--Lisp error: (wrong-type-argument stringp :endgroup)
  string-match("" :endgroup)
  ido-read-internal(list "Tag: " nil nil nil nil)
  ido-completing-read("Tag: " (#("REFILE" 0 6 (inherited t)) :startgroup "@errand" "@office" "@home" :endgroup "PHONE" "WAITING" "HOME" "CANCELLED" "NOTE" "ORG"))
  apply(ido-completing-read "Tag: " (#("REFILE" 0 6 (inherited t)) :startgroup "@errand" "@office" "@home" :endgroup "PHONE" "WAITING" "HOME" "CANCELLED" "NOTE" "ORG") nil)
  org-icompleting-read("Tag: " (#("REFILE" 0 6 (inherited t)) :startgroup "@errand" "@office" "@home" :endgroup "PHONE" "WAITING" "HOME" "CANCELLED" "NOTE" "ORG"))
  org-fast-tag-selection(nil (#("REFILE" 0 6 (inherited t))) ((:startgroup) ("@errand" . 101) ("@office" . 111) ("@home" . 104) (:endgroup) ("PHONE" . 112) ("WAITING" . 119) ("HOME" . 72) ("CANCELLED" . 99) ("NOTE" . 110) ("ORG" . 79) (#("REFILE" 0 6 (inherited t)))) nil)
  org-set-tags(nil nil)
  org-set-tags-command(nil)
  call-interactively(org-set-tags-command nil nil)

I think I nailed down the problem and fixed it in the attached patch.

Changelog:

* lisp/org.el (org-fast-tag-selection): Remove non-string object from org-tag-alist.

Thanks and Regards
Noorul