tabbar-buffer-update-groups was not receiving results from tabbar-buffer-list-function

[TakaakiFuruse]

I tried to hide some tabs with "*" from my tabbar.
After some google search, I found out that overriding "tabbar-buffer-list" does the work.
So I have added

(defun dotspacemacs/user-config ()
  (defun tabbar-buffer-list ()
    (delq nil
          (mapcar #'(lambda (b)
                      (cond
                       ((eq (current-buffer) b) b)
                       ((char-equal ?\  (aref (buffer-name b) 0)) nil)
                       ((equal "buffer *scratch*" (buffer-name b)) b)
                       ((buffer-live-p b) b)))
                   (buffer-list))))

to my .spacemacs file.

However, strangely, my tabbar kept showing me some buffers with "*".

After the fix. It started working.
I have no experience of Lisp, so I am not sure what I am doing, but I can say it started working.
Would you take look at this?

Editor : Spacemacs 0.200.13 (Emacs 25.3.2)
OS : Mint linux 18.3