TypeError on depth >= 8

[ZIJ]

fastpassword -l 10 -d 8

/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/node_modules/babel-runtime/regenerator/runtime.js:469
        throw exception;
              ^
TypeError: undefined is not iterable!
    at TypeError (native)
    at assert (/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/node_modules/core-js/library/modules/$.assert.js:3:45)
    at module.exports.get (/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/node_modules/core-js/library/modules/$.iter.js:41:5)
    at /Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/dist/fastpassword.js:64:62
    at Array.reduce (native)
    at callee$1$0$ (/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/dist/fastpassword.js:58:87)
    at tryCatch (/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/node_modules/babel-runtime/regenerator/runtime.js:67:40)
    at GeneratorFunctionPrototype.invoke [as _invoke] (/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/node_modules/babel-runtime/regenerator/runtime.js:294:22)
    at GeneratorFunctionPrototype.prototype.(anonymous function) [as next] (/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/node_modules/babel-runtime/regenerator/runtime.js:100:21)
    at tryCatch (/Users/izalutsky/.nvm/versions/node/v0.12.3/lib/node_modules/fastpassword/node_modules/babel-runtime/regenerator/runtime.js:67:40)