Calling done() without a function

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Hi,
I was running into an issue today with the following exception:

TypeError: undefined is not a function
    at /var/www/.../node_modules/redis-lock/index.js:75:6

which seems to be for the call to done(). In my code, I have something like:

lock('abc', function (done) {
  ...
  done()
}

That logic in index.js from 71-76 I think needs to check if done is defined or not before using it. Most of the time it may not matter because lockTimeoutValue is generally in the future so the else condition never gets triggered, but when it does, then you'll wind up with the undefined exception.

Does that make sense or am I missing something?

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Thanks!