NoMethodError: undefined method `split' for nil:NilClass

[KamilLelonek]

NoMethodError: undefined method `split' for nil:NilClass
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/middleman-autoprefixer-2.4.2/lib/middleman-autoprefixer/extension.rb:45:in `call'
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/showexceptions.rb:24:in `call'
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/rack-rewrite-1.5.1/lib/rack/rewrite.rb:24:in `call'
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/head.rb:13:in `call'
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/lint.rb:49:in `_call'
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/lint.rb:37:in `call'
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/builder.rb:153:in `call'
    /Users/squixy/.rvm/gems/ruby-2.2.0/gems/rack-1.6.0/lib/rack/handler/webrick.rb:89:in `service'
    /Users/squixy/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
    /Users/squixy/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
    /Users/squixy/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'

[porada]

Could you paste your Gemfile? Is this happening with Middleman 4?

[KamilLelonek]

Nope, a lots of things don't work with Middleman 4 so I'm not using it yet.

    middleman (3.3.7)
      coffee-script (~> 2.2)
      compass (>= 1.0.0, < 2.0.0)
      compass-import-once (= 1.0.5)
      execjs (~> 2.0)
      haml (>= 4.0.5)
      kramdown (~> 1.2)
      middleman-core (= 3.3.7)
      middleman-sprockets (>= 3.1.2)
      sass (>= 3.4.0, < 4.0)
      uglifier (~> 2.5)
    middleman-autoprefixer (2.4.2)
      autoprefixer-rails (~> 5.1.0)
      middleman-core (>= 3.3.3)

[KamilLelonek]

It happens because of 0259f48 especially in

middleman-autoprefixer/lib/middleman-autoprefixer/extension.rb

Line 45 in 0259f48

type = headers['Content-Type'].split(';').first

. There's no 'Content-Type' in headers.

[porada]

Good catch. Could you make a pull request with the fix?

[KamilLelonek]

Done.

[porada]

Thanks a lot! Releasing the fix in a few moments.