/Users/pschambacher/.rbenv/versions/2.3.1/lib/ruby/2.3.0/ostruct.rb:186:in `respond_to_missing?': undefined method `key?' for nil:NilClass (NoMethodError) from /Users/pschambacher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/syck-1.0.5/lib/syck.rb:145:in `transfer' from /Users/pschambacher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/syck-1.0.5/lib/syck.rb:145:in `node_import' from /Users/pschambacher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/syck-1.0.5/lib/syck.rb:145:in `load' from /Users/pschambacher/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/syck-1.0.5/lib/syck.rb:145:in `load' from repro.rb:6:in `
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