Automatic install of Superstatic services causes undefined error

[fastdivision]

After calling superstatic for the first time on an app that required superstatic-forms, I encountered the following error:

 Hey!

The following Superstatic services aren't installed:

  superstatic-forms

They must be installed in order for you to use them locally.
Installing for you now ...

/usr/local/share/npm/lib/node_modules/superstatic/lib/loaders/services.js:59
        services[name.replace('superstatic-', '')] = fn();
                                                     ^
TypeError: undefined is not a function
    at /usr/local/share/npm/lib/node_modules/superstatic/lib/loaders/services.js:59:54
    at Array.forEach (native)
    at /usr/local/share/npm/lib/node_modules/superstatic/lib/loaders/services.js:56:23
    at /usr/local/share/npm/lib/node_modules/superstatic/lib/utils/global-install.js:19:5
    at done (/usr/local/share/npm/lib/node_modules/superstatic/node_modules/async/lib/async.js:135:19)
    at ChildProcess.<anonymous> (/usr/local/share/npm/lib/node_modules/superstatic/node_modules/async/lib/async.js:32:16)
    at ChildProcess.EventEmitter.emit (events.js:98:17)
    at maybeClose (child_process.js:743:16)
    at Socket.<anonymous> (child_process.js:956:11)
    at Socket.EventEmitter.emit (events.js:95:17)