Testing Inversify w/ Mocha causes strange error ERROR_MSGS.NULL_ARGUMENT - node.js

Question

I'm getting the following error when I try to test my code with Mocha/Chai.
Has anyone else seen this error?
/Users/me/Sites/my_project/node_modules/inversify/lib/container/lookup.js:13
throw new Error(ERROR_MSGS.NULL_ARGUMENT);
^
Error: NULL argument
at Lookup.add (/Users/me/Sites/my_project/node_modules/inversify/lib/container/lookup.js:13:19)
at Container.bind (/Users/me/Sites/my_project/node_modules/inversify/lib/container/container.js:121:33)
at Object. (/Users/me/Sites/my_project/test/api-temp/dependency-injection.js:9:15)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object. (/Users/me/Sites/my_project/test/api-temp/services/some.service.js:21:32)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at Object. (/Users/me/Sites/my_project/test/api-temp/services/some.service.spec.js:4:24)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Module.require (module.js:353:17)
at require (internal/module.js:12:17)
at /Users/me/Sites/my_project/node_modules/mocha/lib/mocha.js:222:27
at Array.forEach (native)
at Mocha.loadFiles (/Users/me/Sites/my_project/node_modules/mocha/lib/mocha.js:219:14)
at Mocha.run (/Users/me/Sites/my_project/node_modules/mocha/lib/mocha.js:487:10)
at Object. (/Users/me/Sites/facecards-api/node_modules/mocha/bin/_mocha:459:18)
at Module._compile (module.js:409:26)
at Object.Module._extensions..js (module.js:416:10)
at Module.load (module.js:343:32)
at Function.Module._load (module.js:300:12)
at Function.Module.runMain (module.js:441:10)
at startup (node.js:139:18)
at node.js:968:3
npm ERR! Darwin 16.5.0
npm ERR! argv "/Users/me/.nvm/v4.4.5/bin/node" "/Users/dan/.nvm/v4.4.5/bin/npm" "run" "test-api" "-w"
npm ERR! node v4.4.5
npm ERR! npm v2.15.5
npm ERR! code ELIFECYCLE
npm ERR! my_project#1.0.0 test-api: `mocha -R spec './test/api-temp/**/*.spec.js' --reporter min --inline-diffs`
npm ERR! Exit status 1
The problem occurs when I try to new up the class in my test code.
describe('SomeService', () => {
let someService: any
someService = new SomeService(null, null, null)
mockFunction = sinon.createStubInstance(someService, 'function')
describe('#function', () => {
beforeEach(() => {
result = someService.function(1234)
})
it('should call function', () => {
expect(.callCount).to.eql(1)
})
})
})