Cannot set property 'root' of null

[alepee]

I run a Rails 4.1.0 app and an error occur randomly on precompile during deploy (with mina) or directly throw by local server, etc... this is not yet on production but it could happen on it as well.

The file compiled when this error occurs is different each time, and the error is thrown randomly without any changes to source code.

ExecJS::ProgramError: TypeError: Cannot set property 'root' of null

This error happened using therubyracer 0.12.1 as JS runtime, I did not test it with another runtime yet

This issue has been referenced here jashkenas/coffeescript#3829
The full stack trace I get from Mina on deploy:

ExecJS::ProgramError: TypeError: Cannot set property 'root' of null
(in /home/deploy/tmp/build-142485688618988/app/assets/javascripts/controllers/selections_ctrl.js.coffee)
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/execjs-2.3.0/lib/execjs/ruby_racer_runtime.rb:58:in `rescue in block in call'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/execjs-2.3.0/lib/execjs/ruby_racer_runtime.rb:52:in `block in call'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/execjs-2.3.0/lib/execjs/ruby_racer_runtime.rb:87:in `block in lock'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/execjs-2.3.0/lib/execjs/ruby_racer_runtime.rb:85:in `call'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/execjs-2.3.0/lib/execjs/ruby_racer_runtime.rb:85:in `Locker'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/execjs-2.3.0/lib/execjs/ruby_racer_runtime.rb:85:in `lock'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/execjs-2.3.0/lib/execjs/ruby_racer_runtime.rb:51:in `call'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/coffee-script-2.3.0/lib/coffee_script.rb:76:in `compile'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/tilt-1.4.1/lib/tilt/coffee.rb:46:in `evaluate'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/tilt-1.4.1/lib/tilt/template.rb:103:in `render'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/context.rb:197:in `block in evaluate'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/context.rb:194:in `each'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/context.rb:194:in `evaluate'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/processed_asset.rb:12:in `initialize'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:374:in `new'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:374:in `block in build_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:395:in `circular_call_protection'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:373:in `build_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:94:in `block in build_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/caching.rb:58:in `cache_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:93:in `build_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:287:in `find_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:61:in `find_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/bundled_asset.rb:16:in `initialize'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:377:in `new'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:377:in `build_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:94:in `block in build_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/caching.rb:58:in `cache_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:93:in `build_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/base.rb:287:in `find_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/index.rb:61:in `find_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:211:in `block in find_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:257:in `benchmark'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:210:in `find_asset'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:119:in `block in compile'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:118:in `each'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/sprockets/manifest.rb:118:in `compile'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-rails-2.2.4/lib/sprockets/rails/task.rb:70:in `block (3 levels) in define'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-2.12.3/lib/rake/sprocketstask.rb:146:in `with_logger'
/home/deploy/tmp/build-142485688618988/vendor/bundle/ruby/2.0.0/gems/sprockets-rails-2.2.4/lib/sprockets/rails/task.rb:69:in `block (2 levels) in define'

[alepee]

This issue seems to be linked to latest coffee-script version 1.9.x.
jashkenas/coffeescript#3829

Fixed within a rails project by specifying coffee-script-source version in Gemfile

gem 'coffee-rails'
gem 'coffee-script-source', '~>1.8.0'

[pacuna]

thanks!

[jainyzau]

Thanks, this solved my problem. Hope this can be fixed in latest version of coffee-script.

[deepak07]

This solved my issue. Thanks :)