EC2で構築したrailsアプリにてローカルからCapistranoを使用した自動デプロイが失敗する

前提・実現したいこと

ここに質問の内容を詳しく書いてください。
awsにてnginx＋unicornで構築したrailsアプリケーションをCapistranoを使用し、自動デプロイを行おうとしているのですが、assets:precompileが失敗し、デプロイが成功しません。

発生している問題・エラーメッセージ

Tasks: TOP => deploy:assets:precompile
(See full trace by running task with --trace)
The deploy has failed with an error: Exception while executing as *********: rake exit status: 1
rake stdout: Nothing written
rake stderr: rake aborted!
Uglifier::Error: Unexpected character '`'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/uglifier-4.1.20/lib/uglifier.rb:234:in `parse_result'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/uglifier-4.1.20/lib/uglifier.rb:216:in `run_uglifyjs'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/uglifier-4.1.20/lib/uglifier.rb:168:in `compile'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/uglifier_compressor.rb:53:in `call'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/uglifier_compressor.rb:28:in `call'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:75:in `call_processor'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:57:in `block in call_processors'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `reverse_each'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/processor_utils.rb:56:in `call_processors'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:134:in `load_from_unloaded'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:60:in `block in load'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:317:in `fetch_asset_from_dependency_cache'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/loader.rb:44:in `load'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:20:in `block in initialize'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/cached_environment.rb:47:in `load'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:66:in `find_asset'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/base.rb:73:in `find_all_linked_assets'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:142:in `block in find'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:114:in `block (2 levels) in logical_paths'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:228:in `block in stat_tree'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:212:in `block in stat_directory'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `each'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:209:in `stat_directory'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/path_utils.rb:227:in `stat_tree'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `each'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:105:in `block in logical_paths'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `each'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/legacy.rb:104:in `logical_paths'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:140:in `find'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/sprockets/manifest.rb:186:in `compile'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-3.7.2/lib/rake/sprocketstask.rb:147:in `with_logger'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/var/www/chatspace/shared/bundle/ruby/2.3.0/gems/rake-12.3.2/exe/rake:27:in `<top (required)>'
/home/ec2-user/.rbenv/versions/2.3.1/bin/bundle:23:in `load'
/home/ec2-user/.rbenv/versions/2.3.1/bin/bundle:23:in `<main>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

該当のソースコード

Capfile
1require "capistrano/setup"
2require "capistrano/deploy"
3require 'capistrano/scm/git'
4install_plugin Capistrano::SCM::Git
5
6require 'capistrano/rbenv'
7require 'capistrano/bundler'
8require 'capistrano/rails/assets'
9require 'capistrano/rails/migrations'
10require 'capistrano3/unicorn'
11
12Dir.glob("lib/capistrano/tasks/*.rake").each { |r| import r }

deploy
1# config valid for current version and patch releases of Capistrano
2lock "~> 3.11.0"
3
4set :application, "chatspace"
5set :repo_url, "git@github.com:*******/******.git"
6
7set :linked_dirs, fetch(:linked_dirs, []).push('log', 'tmp/pids', 'tmp/cache', 'tmp/sockets', 'vendor/bundle', 'public/system', 'public/uploads')
8
9set :rbenv_type, :user
10set :rbenv_ruby, '2.3.1'
11
12set :ssh_options, auth_methods: ['publickey'],
13    keys: ['~/.ssh/*****.pem']
14
15set :unicorn_pid, -> { "#{shared_path}/tmp/pids/unicorn.pid" }
16set :unicorn_config_path, -> { "#{current_path}/config/unicorn.rb" }
17set :keep_releases, 5
18
19set :linked_files, %w{ config/secrets.yml }
20
21after 'deploy:publishing', 'deploy:restart'
22namespace :deploy do
23  task :restart do
24    invoke 'unicorn:restart'
25  end
26
27  desc 'upload secrets.yml'
28  task :upload do
29    on roles(:app) do |host|
30      if test "[ ! -d #{shared_path}/config ]"
31        execute "mkdir -p #{shared_path}/config"
32      end
33      upload!('config/secrets.yml', "#{shared_path}/config/secrets.yml")
34    end
35  end
36  before :starting, 'deploy:upload'
37  after :finishing, 'deploy:cleanup'
38end
39
40set :default_env, {
41  rbenv_root: "/usr/local/rbenv",
42  path: "/usr/local/rbenv/shims:/usr/local/rbenv/bin:$PATH",
43  AWS_ACCESS_KEY_ID: ENV["AWS_ACCESS_KEY_ID"],
44  AWS_SECRET_ACCESS_KEY: ENV["AWS_SECRET_ACCESS_KEY"]
45}
46

試したこと

Uglifier::Error: Unexpected character '`'のエラー文が気になり以下色々試しました。

/config/environments/production.rbの以下をコメントアウトを試しましたがダメでした。
config.assets.js_compressor = :uglifier
上記の箇所を以下に変更したりしましたが、同様のエラーが発生しています。
config.assets.js_compressor = Uglifier.new(harmony: true)

一点気になりところとしては、コンパイルされるjsファイルの中身の変数にバッククォーテーションを使用しているので、
そこで引っかかっているのでは？と考えていますが、わからないので、知恵をお貸しいただければと思います。