Expected behavior

File type selector will show up to select for ag/rg.

Actual behavior from emacs-helm.sh if possible (See note at bottom)

When helm-adaptive-mode is on, run helm-do-grep-ag with type selector will fail with error "Wrong type argument: lisp, \.\.\.".

Steps to reproduce (recipe)

1. My setup for helm.

(use-package helm
  :config
  (require 'helm-config)
  (helm-mode)
  (helm-adaptive-mode t)
  (setq helm-grep-ag-command "rg --color=always --smart-case --no-heading --line-number %s %s %s")
  :bind
  (("C-x g" . helm-do-grep-ag)))

2. Start helm-do-grep-ag with type select using C-u C-x g.

Describe versions of helm, emacs, operating system etc.

Emacs: 25.1.1 on MacOS Sierra (brew cask install emacs)
Helm: helm-20170503