Error when starting alchemy-mode

error.el

Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
  define-key((keymap) nil alchemist-phoenix-command-map)
  byte-code("\302 \303	\304#\210)\207" [map alchemist-key-command-prefix make-sparse-keymap define-key alchemist-phoenix-command-map] 4)
  (defvar alchemist-phoenix-mode-map (byte-code "\302 \303	\304#\210)\207" [map alchemist-key-command-prefix make-sparse-keymap define-key alchemist-phoenix-command-map] 4) ("/home/leo/.emacs.d/elpa/alchemist-20170803.414/alchemist-phoenix.elc" . 3135))
  require(alchemist-phoenix)
  eval-buffer(#<buffer  *load*> nil "/home/leo/.emacs.d/elpa/alchemist-20170803.414/alchemist.el" nil t)  ; Reading at buffer position 2686
  load-with-code-conversion("/home/leo/.emacs.d/elpa/alchemist-20170803.414/alchemist.el" "/home/leo/.emacs.d/elpa/alchemist-20170803.414/alchemist.el" nil t)
  autoload-do-load((autoload "alchemist" "Toggle alchemist mode.\n\nKey bindings:\n\\{alchemist-mode-map}\n\n(fn &optional ARG)" t nil) alchemist-mode)
  command-execute(alchemist-mode record)
  execute-extended-command(nil "alchemist-mode" nil)
  funcall-interactively(execute-extended-command nil "alchemist-mode" nil)
  call-interactively(execute-extended-command nil nil)
  command-execute(execute-extended-command)