Tag fuzzy search hangs; ctrl+c'ing produces "NoMethodError: undefined method `map' for nil:NilClass"

First of all I absolutely love this project and am really thankful to all of you for making it.

Problem Ever since I recreated my VM a few weeks ago and reinstalled Command-T, the tag fuzzy find feature has been broken. When I open up the tag search menu, the prompt (>>) does not show and I cannot type anything.

When I hit Ctrl+c, I see the following error:

Command-T [Tags]                                                                                                                                                                                                                                            0,0-1          All
>>
Error detected while processing function commandt#TagFinder:
line    2:
NoMethodError: undefined method `map' for nil:NilClass
Interrupt: Press ENTER or type command to continue

My environment: I think I am on some version on master, following 5.0.3, based on the following snipped in docs/command-t.text:

HISTORY                                         command-t-history

master (not yet released)

- Fix possible E434 when trying to jump to some help targets.
- Use execute() when available to avoid possible issues with
  potentially nested calls to :redir.
- Fix conflict with vim-cool plugin (#354).
- Close match listing after buffer deletion to avoid likely errors on
  subsequent interactions (#357, patch from Andrius Grabauskas).

5.0.3 (19 September 2018)

- Fix unlisted buffers showing up in :CommandTBuffer listing on Neovim.
- Fix edge cases with opening selections in tabs (#315).
- Fix possible degenerate performance of :CommandTBuffer and
  :CommandTMRU on Neovim.
- Handle missing match listing buffer in Neovim (#342).

  ~/main/kernel: lsb_release -a
LSB Version:    core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4
.1-noarch
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.5 LTS
Release:        14.04
Codename:       trusty

  ~/main/kernel: vim --version
VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Dec 18 2015 21:31:10)
Included patches: 1-882
Modified by pkg-vim-maintainers@lists.alioth.debian.org
Compiled by buildd@
Huge version without GUI.  Features included (+) or not (-):
+acl             +farsi           +mouse_netterm   +syntax
+arabic          +file_in_path    +mouse_sgr       +tag_binary
+autocmd         +find_in_path    -mouse_sysmouse  +tag_old_static
-balloon_eval    +float           +mouse_urxvt     -tag_any_white
-browse          +folding         +mouse_xterm     +tcl
++builtin_terms  -footer          +multi_byte      +terminfo
+byte_offset     +fork()          +multi_lang      +termresponse
+cindent         +gettext         -mzscheme        +textobjects
-clientserver    -hangul_input    +netbeans_intg   +title
-clipboard       +iconv           +path_extra      -toolbar
+cmdline_compl   +insert_expand   +perl            +user_commands
+cmdline_hist    +jumplist        +persistent_undo +vertsplit
+cmdline_info    +keymap          +postscript      +virtualedit
+comments        +langmap         +printer         +visual
+conceal         +libcall         +profile         +visualextra
+cryptv          +linebreak       +python          +viminfo
+cscope          +lispindent      -python3         +vreplace
+cursorbind      +listcmds        +quickfix        +wildignore
+cursorshape     +localmap        +reltime         +wildmenu
+dialog_con      +lua             +rightleft       +windows
+diff            +menu            +ruby            +writebackup
+digraphs        +mksession       +scrollbind      -X11
-dnd             +modify_fname    +signs           -xfontset
-ebcdic          +mouse           +smartindent     -xim
+emacs_tags      -mouseshape      -sniff           -xsmp
+eval            +mouse_dec       +startuptime     -xterm_clipboard
+ex_extra        +mouse_gpm       +statusline      -xterm_save
+extra_search    -mouse_jsbterm   -sun_workshop    -xpm
   system vimrc file: "$VIM/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
  fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H     -g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1      -I/usr/include/tcl8.6  -D_REENTRANT=1  -D_THREAD_SAFE=1  -D_LARGEFILE64_SOURCE=1
Linking: gcc   -L. -Wl,-Bsymbolic-functions -Wl,-z,relro -L/build/buildd/ruby1.9.1-1.9.3.484/debian/lib -rdynamic -Wl,-export-dynamic -Wl,-E  -Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -Wl,--as-needed -o vim        -lm -ltinfo -lnsl  -lselinux  -lacl -lattr -lgpm -ldl  -L/usr/lib -llua5.2 -Wl,-E  -fstack-protector -L/usr/local/lib  -L/usr/lib/perl/5.18/CORE -lperl -ldl -lm -lpthread -lcrypt -L/usr/lib/python2.7/config-x86_64-linux-gnu -lpython2.7 -lpthread -ldl -lutil -lm -Xlinker -export-dynamic -Wl,-O1 -Wl,-Bsymbolic-functions  -L/usr/lib/x86_64-linux-gnu -ltcl8.6 -ldl -lz -lpthread -lieee -lm -lruby-1.9.1 -lpthread -lrt -ldl -lcrypt -lm  -L/usr/lib

  ~/.vim/bundle/command-t: ruby --version
ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]

Ruby version in Vim:

:ruby puts "#{RUBY_VERSION}-p#{RUBY_PATCHLEVEL}"
1.9.3-p484

Please let me know if there's more info I can give or anything I can do to help. Thank you!

wincent / command-t

Tag fuzzy search hangs; ctrl+c'ing produces "NoMethodError: undefined method `map' for nil:NilClass" #363