neovim airblade/vim-gitgutter issue

foo.bash

$ nvim --version                                                                                                                                                                                               ✓  10566  14:02:06
NVIM v0.2.0

# Since upgrading Neovim I am getting errors when opening files
# that are in git repos. gitgutter seems to be culprit but no idea why?
# If I remove following from plug.vim git repo files load w/o error.
# Plug 'airblade/vim-gitgutter'

$ nvim ~/code/terraform-thing/baseline.tf
# After pressning enter to work through the error messages in nvim
# I do this in Normal mode to list them all
:messages
Error detected while processing function gitgutter#async#handle_diff_job_nvim:
line    1:
E121: Undefined variable: self
Error detected while processing function gitgutter#async#handle_diff_job_nvim:
line    1:
E116: Invalid arguments for function gitgutter#debug#log
Error detected while processing function gitgutter#async#handle_diff_job_nvim:
line    1:
E121: Undefined variable: self
Error detected while processing function gitgutter#async#handle_diff_job_nvim:
line    1:
E116: Invalid arguments for function gitgutter#debug#log
E492: Not an editor command: errormsg
Error detected while processing function gitgutter#async#handle_diff_job_nvim:
line    1:
E121: Undefined variable: self
E116: Invalid arguments for function gitgutter#debug#log
E121: Undefined variable: self
E116: Invalid arguments for function gitgutter#debug#log