prompt tells me about possibly problematic git author setting

.bash_profile

# Git completion
if [[ -f "$HOME/.git-completion.bash" ]]; then
  source "$HOME/.git-completion.bash"
  __has_gitdir=true
elif [[ -n $(which brew) && -f "`brew --prefix`/etc/bash_completion.d/git-completion.bash" ]]; then
  . `brew --prefix`/etc/bash_completion.d/git-completion.bash
  __has_gitdir=true
else
  function __git_ps1() {
    printf ""
  }
  __has_gitdir=false
fi

function __git_author() {
  if [ __has_gitdir -a -n "$(__gitdir)" ]; then

    email=`git config user.email`
    domain=${email#*@}
    user=${email%@*}

    if [ "$user" != "${user%+*}" ]; then
      users_to_color=${user#*+}
      colored_users=${user%%+*}
      while [ "$users_to_color" != "" ]; do
        colored_users="$colored_users${COLOR_LIGHT_RED}+${COLOR_LIGHT_CYAN}${users_to_color%%+*}"
        if [ "$users_to_color" = "${users_to_color#*+}" ]; then
          users_to_color=""
        else
          users_to_color=${users_to_color#*+}
        fi
      done
      user=$colored_users
    fi

    working_dir=`pwd`
    if [ ${working_dir:0:${#SQUARE_HOME}} = $SQUARE_HOME ]; then
      if [ $domain != "squareup.com" ]; then
        domain="${COLOR_LIGHT_RED}$domain${COLOR_LIGHT_CYAN}"
      fi
    else
      if [ $domain = "squareup.com" ]; then
        domain="${COLOR_LIGHT_RED}$domain${COLOR_LIGHT_CYAN}"
      fi
    fi

    printf " $user@$domain"
  fi
}

export PS1="\[${COLOR_LIGHT_GRAY}\]\w\[${COLOR_LIGHT_CYAN}\]\$(__git_author)\$(__git_ps1 \" %s\")\[${COLOR_NC}\] "