Bug in node.js require function

Just try to clone that repo and call node index.js

You'll see an error just like this:

bobrik@server:~/****/node_modules/bug$ node index.js 
Bug included! Running script
1

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
TypeError: Cannot call method 'createUserById' of undefined
    at Object.getAdminUser (/home/bobrik/****/node_modules/bug/Admin.js:7:29)
    at Object.run (/home/bobrik/****/node_modules/bug/Script.js:9:27)
    at Object.<anonymous> (/home/bobrik/****/node_modules/bug/index.js:5:8)
    at Module._compile (module.js:404:26)
    at Object..js (module.js:410:10)
    at Module.load (module.js:336:31)
    at Function._load (module.js:297:12)
    at Array.<anonymous> (module.js:423:10)
    at EventEmitter._tickCallback (node.js:126:26)

BUT!

Open Admin.js and comment out line 7 and everything goes well.

I suppose this is wrong behavior.