Why fork of the module doesn't work

We have module - https://github.com/ageitgey/node-unfluff

It works:

npm install unfluff

extractor = require('unfluff');
data = extractor(my_html_data);
console.log(data);

If I make fork on the github, without any change, it is don't work

npm install git+https://github.com/.../node-unfluff.git

extractor = require('unfluff');
data = extractor(my_html_data);
console.log(data);

What it can be? Any idea?

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