[4.0.1] undefined method `+' for nil:NilClass

[afuno]

Rails 6.0.3.1, Ruby 2.6.6.

---

After today's update deployment began to fall:

[4/4] Building fresh packages...
Done in 4.47s.
I, [2020-06-05T08:24:43.028785 #2084]  INFO -- : Writing /tmp/build/public/assets/active_admin-312e30985f3b0561c5db85eaba9b50b1d2c6fcbcff0e0cd5ae0862f13ef86223796473.css
I, [2020-06-05T08:24:43.029586 #2084]  INFO -- : Writing /tmp/build/public/assets/active_admin-312e30985f3b0561c5db85eaba9b50b1d2c6fcbcff0e0cd5ae0862f13ef86223796473.css.gz
I, [2020-06-05T08:24:43.030653 #2084]  INFO -- : Writing /tmp/build/public/assets/manifest-312e3075a11da44c802486bc6f65640aa48a730f0f684c5c07a42ba3cd1735eb3fb070.js
I, [2020-06-05T08:24:43.031240 #2084]  INFO -- : Writing /tmp/build/public/assets/manifest-312e3075a11da44c802486bc6f65640aa48a730f0f684c5c07a42ba3cd1735eb3fb070.js.gz
rake aborted!
NoMethodError: undefined method `+' for nil:NilClass
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/sprockets/asset.rb:138:in `etag'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/sprockets/asset.rb:67:in `block in digest_path'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/sprockets/asset.rb:67:in `sub'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/sprockets/asset.rb:67:in `digest_path'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/sprockets/manifest.rb:175:in `block in compile'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/sprockets/manifest.rb:173:in `each'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/sprockets/manifest.rb:173:in `compile'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:68:in `block (3 levels) in define'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.1/lib/rake/sprocketstask.rb:148:in `with_logger'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/sprockets-rails-3.2.1/lib/sprockets/rails/task.rb:67:in `block (2 levels) in define'
/tmp/build/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

New assets (active_admin, manifest) were compiled due to an update.

I rolled back to version 4.0.0 - everything was successfully deployed with it.

Related issue: #682

[alliedarmour]

Same problem here!

In my case the problem comes from the manifest.json.erb file which I use to let my application run as a PWA.

That line is throwing the error:

"src": "<%= asset_path('icon_small.png') %>",

Rails: 6.0.3.1
Ruby: 2.6.5

[thorpj]

Was about to post an issue myself, instead I'll add the info here:

Rails: 5.2.4.3
Ruby: 2.5.1p57
Host: Ubuntu Server 18.04.4

After running:

bundle update
RAILS_ENV=production RAILS_SERVE_STATIC_FILES=off rails assets:precompile

A NoMethodError was raised for sprockets-4.0.1/lib/sprockets/asset.rb:138 in 'etag'
NoMethodError: undefined method '+' for nil:NilClass
Full error: https://gist.github.com/thorpj/3fb472d2a57afbb88bb0d347d9b508c8

The relevant method in assets.rb:

def etag                                                                                                                                                                                                                                                                         
    DigestUtils.pack_hexdigest(environment_version + digest)                                                                                                                                                                                                                     
end 

• Sprockets went from 4.0.0 to 4.0.1 in that bundle update.
• I had also just pushed some updates to this rails server. The changes were very minor and no changes were made to my CSS or JS. I call assets:precompile every time I update this server,

• The only other mention I could find was this SO post: https://stackoverflow.com/questions/62208867/rails-deployment-to-heroku-nomethoderror-undefined-method-for-nilnilclass

[Eric-Guo]

Caused by #678 and if change config/initializers/assets.rb, at least resolved at my project.

-Rails.application.config.assets.version = '1.0'
+Rails.application.config.assets.version = 'v1.0'

[maltesa]

Caused by #678 and if change config/initializers/assets.rb, at least resolved at my project.

-Rails.application.config.assets.version = '1.0'
+Rails.application.config.assets.version = 'v1.0'

That solved the issue for me. Thanks a lot @Eric-Guo

[jeffreycastro]

Caused by #678 and if change config/initializers/assets.rb, at least resolved at my project.

-Rails.application.config.assets.version = '1.0'
+Rails.application.config.assets.version = 'v1.0'

This worked for me as well.
But does anyone know when we need to change the version? I dont want to wait for Heroku deploy to fail first before updating this value.

[afuno]

Caused by #678 and if change config/initializers/assets.rb, at least resolved at my project.

-Rails.application.config.assets.version = '1.0'
+Rails.application.config.assets.version = 'v1.0'

That solved the issue for me. Thanks a lot @Eric-Guo

This should not be a solution.
Thousands of projects have to change this line? No.
The solution must be inside this library.

[rafaelfranca]

Could you try the master branch to see if it is fixed? I'll release 4.0.2 when it is confirmed

[thibaudgg]

4.0.2 works for me, thanks for the fix. 👍

[markets]

@rafaelfranca just tried master branch and it seems resolved for me too. Thanks!

[matteeyah]

I created a PR to make master green again to unblock the 4.0.2 release that has thix fix - #685

[andrewhood125]

gem "sprockets", github: 'rails/sprockets' # shouldn't be needed anymore

$ bundle update

For those following along. Thanks for fixing this so quickly!

[rafaelfranca]

4.0.2 was released

[afuno]

Successfully. Thanks.