Installation fails

Hey, I'm getting following output when trying to install the package:
```
Command failed: npm install --save-dev --loglevel error ember-cli-deploy-new-relic-sourcemap
npm ERR! Darwin 16.7.0
npm ERR! argv "/usr/local/Cellar/node/7.2.0/bin/node" "/usr/local/bin/npm" "install" "--save-dev" "--loglevel error" "ember-cli-deploy-new-relic-sourcemap"
npm ERR! node v7.2.0
npm ERR! npm v3.10.9

npm ERR! Cannot convert undefined or null to object
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!

npm ERR! Please include the following file with any support request:
npm ERR! /Users/bajena/Code/francium/npm-debug.log

Error: Command failed: npm install --save-dev --loglevel error ember-cli-deploy-new-relic-sourcemap
npm ERR! Darwin 16.7.0
npm ERR! argv "/usr/local/Cellar/node/7.2.0/bin/node" "/usr/local/bin/npm" "install" "--save-dev" "--loglevel error" "ember-cli-deploy-new-relic-sourcemap"
npm ERR! node v7.2.0
npm ERR! npm v3.10.9

npm ERR! Cannot convert undefined or null to object
npm ERR!
npm ERR! If you need help, you may report this error at:
npm ERR!

npm ERR! Please include the following file with any support request:
npm ERR! /Users/bajena/Code/francium/npm-debug.log

at Promise.all.then.arr (/Users/bajena/Code/francium/node_modules/execa/index.js:236:11)
at process._tickDomainCallback (internal/process/next_tick.js:129:7)
```

do you have any idea what could cause it?

Here's my npm-debug.log:
```
0 info it worked if it ends with ok
1 verbose cli [ '/usr/local/Cellar/node/7.2.0/bin/node',
1 verbose cli '/usr/local/bin/npm',
1 verbose cli 'install',
1 verbose cli '--save-dev',
1 verbose cli '--loglevel error',
1 verbose cli 'ember-cli-deploy-new-relic-sourcemap' ]
2 info using npm@3.10.9
3 info using node@v7.2.0
4 silly loadCurrentTree Starting
5 silly install loadCurrentTree
6 silly install readLocalPackageData
7 silly fetchPackageMetaData ember-cli-deploy-new-relic-sourcemap
8 silly fetchNamedPackageData ember-cli-deploy-new-relic-sourcemap
9 silly mapToRegistry name ember-cli-deploy-new-relic-sourcemap
10 silly mapToRegistry using default registry
11 silly mapToRegistry registry https://registry.npmjs.org/
12 silly mapToRegistry data Result {
12 silly mapToRegistry raw: 'ember-cli-deploy-new-relic-sourcemap',
12 silly mapToRegistry scope: null,
12 silly mapToRegistry escapedName: 'ember-cli-deploy-new-relic-sourcemap',
12 silly mapToRegistry name: 'ember-cli-deploy-new-relic-sourcemap',
12 silly mapToRegistry rawSpec: '',
12 silly mapToRegistry spec: 'latest',
12 silly mapToRegistry type: 'tag' }
13 silly mapToRegistry uri https://registry.npmjs.org/ember-cli-deploy-new-relic-sourcemap
14 verbose request uri https://registry.npmjs.org/ember-cli-deploy-new-relic-sourcemap
15 verbose request no auth needed
16 info attempt registry request try #1 at 10:49:50
17 verbose request id 524eb7855f47367a
18 verbose etag "58ee9ae1-1cb"
19 verbose lastModified Wed, 12 Apr 2017 21:23:45 GMT
20 http request GET https://registry.npmjs.org/ember-cli-deploy-new-relic-sourcemap
21 http 304 https://registry.npmjs.org/ember-cli-deploy-new-relic-sourcemap
22 verbose headers { date: 'Wed, 13 Dec 2017 09:49:50 GMT',
22 verbose headers via: '1.1 varnish',
22 verbose headers 'cache-control': 'max-age=300',
22 verbose headers etag: '"58ee9ae1-1cb"',
22 verbose headers age: '0',
22 verbose headers connection: 'keep-alive',
22 verbose headers 'x-served-by': 'cache-hhn1527-HHN',
22 verbose headers 'x-cache': 'MISS',
22 verbose headers 'x-cache-hits': '0',
22 verbose headers 'x-timer': 'S1513158591.883275,VS0,VE186',
22 verbose headers vary: 'Accept-Encoding, Accept' }
23 silly get cb [ 304,
23 silly get { date: 'Wed, 13 Dec 2017 09:49:50 GMT',
23 silly get via: '1.1 varnish',
23 silly get 'cache-control': 'max-age=300',
23 silly get etag: '"58ee9ae1-1cb"',
23 silly get age: '0',
23 silly get connection: 'keep-alive',
23 silly get 'x-served-by': 'cache-hhn1527-HHN',
23 silly get 'x-cache': 'MISS',
23 silly get 'x-cache-hits': '0',
23 silly get 'x-timer': 'S1513158591.883275,VS0,VE186',
23 silly get vary: 'Accept-Encoding, Accept' } ]
24 verbose etag https://registry.npmjs.org/ember-cli-deploy-new-relic-sourcemap from cache
```