error: Abort trap: 6 read "${read_flags[@]}" -srn 1

I installed fff and fff.vim. But I am getting the following error when I use :F command.

    /usr/local/bin/fff: line 86: 41380 Abort trap: 6           read "${read_flags[@]}" -srn 1

I am running nvim on osx mojave with the following features:

nvim --version
  ##> NVIM v0.4.2
  ##> Build type: Release
  ##> LuaJIT 2.0.5
  ##> Compilation: /usr/local/Homebrew/Library/Homebrew/shims/mac/super/clang -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -DNDEBUG -DMIN_LOG_LEVEL=3 -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -I/tmp/neovim-20190916-88369-176iaxs/neovim-0.4.2/build/config -I/tmp/neovim-20190916-88369-176iaxs/neovim-0.4.2/src -I/usr/local/include -I/tmp/neovim-20190916-88369-176iaxs/neovim-0.4.2/deps-build/include -I/usr/local/opt/gettext/include -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include -I/tmp/neovim-20190916-88369-176iaxs/neovim-0.4.2/build/src/nvim/auto -I/tmp/neovim-20190916-88369-176iaxs/neovim-0.4.2/build/include
  ##> Compiled by brew@Mojave-2.local
  ##> 
  ##> Features: +acl +iconv +tui
  ##> See ":help feature-compile"
  ##> 
  ##>    system vimrc file: "$VIM/sysinit.vim"
  ##>   fall-back for $VIM: "/usr/local/Cellar/neovim/0.4.2/share/nvim"
  ##> 
  ##> Run :checkhealth for more info

I disabled all the plugins and run nvim with fff.vim enabled only. The same mistake occurred.

Here is the results of :checkhealth

health#deoplete#check
========================================================================
## deoplete.nvim
  - OK: exists("v:t_list") was successful
  - OK: has("timers") was successful
  - OK: has("python3") was successful
  - INFO: If you're still having problems, try the following commands:
    $ export NVIM_PYTHON_LOG_FILE=/tmp/log
    $ export NVIM_PYTHON_LOG_LEVEL=DEBUG
    $ nvim
    $ cat /tmp/log_{PID}
    and then create an issue on github

health#vimtex#check
========================================================================
## vimtex
  - OK: Vim version should have full support!
  - OK: General viewer should work properly!
  - ERROR: |g:vimtex_compiler_method| (`latexmk`) is not executable!

health#nvim#check
========================================================================
## Configuration
  - OK: no issues found

## Performance
  - OK: Build type: Release

## Remote Plugins
  - OK: Up to date

## terminal
  - INFO: key_backspace (kbs) terminfo entry: key_backspace=^H
  - INFO: key_dc (kdch1) terminfo entry: key_dc=\E[3~
  - INFO: $TERM_PROGRAM='iTerm.app'
  - INFO: $COLORTERM='truecolor'

## tmux
  - OK: escape-time: 0ms
  - INFO: $TERM: screen-256color
  - WARNING: Neither Tc nor RGB capability set. True colors are disabled. |'termguicolors'| won't work properly.
    - ADVICE:
      - Put this in your ~/.tmux.conf and replace XXX by your $TERM outside of tmux:
          set-option -sa terminal-overrides ',XXX:RGB'
      - For older tmux versions use this instead:
          set-option -ga terminal-overrides ',XXX:Tc'

health#provider#check
========================================================================
## Clipboard (optional)
  - OK: Clipboard tool found: pbcopy

## Python 2 provider (optional)
  - INFO: Using: g:python_host_prog = "/usr/local/bin/python3"
  - INFO: Executable: /usr/local/bin/python3
  - WARNING: Unexpected Python version. This could lead to confusing error messages.
  - INFO: Python version: 3.7.4
  - INFO: pynvim version: 0.2.6 (outdated; from /usr/local/lib/python3.7/site-packages/neovim)
  - WARNING: Latest pynvim is NOT installed: 0.3.2

## Python 3 provider (optional)
  - INFO: Using: g:python3_host_prog = "/usr/local/bin/python3"
  - INFO: Executable: /usr/local/bin/python3
  - INFO: Python version: 3.7.4
  - INFO: pynvim version: 0.2.6 (outdated; from /usr/local/lib/python3.7/site-packages/neovim)
  - WARNING: Latest pynvim is NOT installed: 0.3.2

## Ruby provider (optional)
  - INFO: Ruby: ruby 2.4.3p205 (2017-12-14 revision 61247) [x86_64-darwin15]
  - WARNING: `neovim-ruby-host` not found.
    - ADVICE:
      - Run `gem install neovim` to ensure the neovim RubyGem is installed.
      - Run `gem environment` to ensure the gem bin directory is in $PATH.
      - If you are using rvm/rbenv/chruby, try "rehashing".
      - See :help |g:ruby_host_prog| for non-standard gem installations.

## Node.js provider (optional)
  - INFO: Node.js: v10.4.0
  - INFO: Neovim node.js host: /Users/mertnuhoglu/n/lib/node_modules/neovim/bin/cli.js
  - WARNING: Package "neovim" is out-of-date. Installed: 4.2.1, latest: 4.5.0
    - ADVICE:
      - Run in shell: npm install -g neovim
      - Run in shell (if you use yarn): yarn global add neovim

dylanaraps / fff.vim

error: Abort trap: 6 read "${read_flags[@]}" -srn 1 #6