image_optim sprockets preprocessor fails at .webp image

[thehappycoder]

$ RAILS_ENV=production rake assets:precompile
svgo worker: `svgo` not found; please provide proper binary or disable this worker (--no-svgo argument or `:svgo => false` through options)
rake aborted!
Sprockets::EncodingError: /Users/anton/pwork/utro/app/assets/images/sprites/1x/build/extra/extra-no-repeat-offset-x.png.webp has a invalid UTF-8 byte sequence
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/utils.rb:19:in `block (2 levels) in read_unicode'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/utils.rb:13:in `tap'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/utils.rb:13:in `block in read_unicode'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/utils.rb:12:in `open'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/utils.rb:12:in `open'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/utils.rb:12:in `read_unicode'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/context.rb:188:in `evaluate'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/processed_asset.rb:12:in `initialize'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:374:in `new'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:374:in `block in build_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:395:in `circular_call_protection'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:373:in `build_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/index.rb:94:in `block in build_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/caching.rb:58:in `cache_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/index.rb:93:in `build_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:287:in `find_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/index.rb:61:in `find_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/bundled_asset.rb:16:in `initialize'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:377:in `new'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:377:in `build_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/index.rb:94:in `block in build_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/caching.rb:58:in `cache_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/index.rb:93:in `build_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/base.rb:287:in `find_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/index.rb:61:in `find_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/manifest.rb:211:in `block in find_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/manifest.rb:257:in `benchmark'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/manifest.rb:210:in `find_asset'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/manifest.rb:119:in `block in compile'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/manifest.rb:118:in `each'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/sprockets/manifest.rb:118:in `compile'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-rails-2.3.3/lib/sprockets/rails/task.rb:70:in `block (3 levels) in define'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-2.12.4/lib/rake/sprocketstask.rb:146:in `with_logger'
/Users/anton/.rvm/gems/ruby-2.2.3/gems/sprockets-rails-2.3.3/lib/sprockets/rails/task.rb:69:in `block (2 levels) in define'
/Users/anton/.rvm/gems/ruby-2.2.3/bin/ruby_executable_hooks:15:in `eval'
/Users/anton/.rvm/gems/ruby-2.2.3/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => assets:precompile
(See full trace by running task with --trace)

When I disable it (config.assets.image_optim = false), all is fine.

[toy]

I've tried putting the first webp found in web without problems.
Is it possible for you to share the image causing problems, or does it happen with any webp image?

[thehappycoder]

It choked on the first webp in my project. png, jpg files were ok
extra-no-repeat-offset-x.png.webp.zip

[stevenbarragan]

did you try?

npm install -g svgo