Angular2 unit tests. 'Npm test' runs successfully only once and never again

I'm trying to setup unit test for my Angular2 project following the directions here: http://ift.tt/2dbCjkl Using this project first time I run npm test everything works fine. Than I press ctrl-c to stop testing session. Next time I execute npm test without any changes to the project it fails with the following error:

[1] Chrome 53.0.2785 (Windows 10 0.0.0) LOG: Error{originalErr: Error{}}
[1]
    Chrome 53.0.2785 (Windows 10 0.0.0): Executed 0 of 4 SUCCESS (0 secs / 0 secs)
[1] Missing error handler on `socket`.
[1] TypeError: Cannot set property '49007121' of null
[1]     at createHtmlResults (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:57:32)
[1]     at initializeHtmlForBrowser (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:78:5)
[1]     at HTMLReporter.onBrowserStart (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:91:5)
[1]     at Server.<anonymous> (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\events.js:13:22)
[1]     at emitTwo (events.js:111:20)
[1]     at Server.emit (events.js:191:7)
[1]     at Browser.onStart (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\browser.js:126:13)
[1]     at Socket.<anonymous> (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\events.js:13:22)
[1]     at emitOne (events.js:101:20)
[1]     at Socket.emit (events.js:188:7)
[1]     at Socket.onevent (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\socket.js:335:8)
[1]     at Socket.onpacket (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\socket.js:295:12)
[1]     at Client.ondecoded (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\client.js:193:14)
[1]     at Decoder.Emitter.emit (C:\Projects\Tmp\ng-karma-test\node_modules\component-emitter\index.js:134:20)
[1]     at Decoder.add (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io-parser\index.js:247:12)
[1]     at Client.ondata (C:\Projects\Tmp\ng-karma-test\node_modules\socket.io\lib\client.js:175:18)
    Chrome 53.0.2785 (Windows 10 0.0.0) ERROR
[1]   Disconnectedundefined
    Chrome 53.0.2785 (Windows 10 0.0.0): Executed 0 of 4 DISCONNECTED (5.004 secs / 0 secs)
[1] 18 09 2016 18:34:21.946:ERROR [karma]: TypeError: Cannot read property '49007121' of null
[1]     at HTMLReporter.onBrowserComplete (C:\Projects\Tmp\ng-karma-test\node_modules\karma-htmlfile-reporter\index.js:95:23)
[1]     at Server.<anonymous> (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\events.js:13:22)
[1]     at emitOne (events.js:101:20)
[1]     at Server.emit (events.js:188:7)
[1]     at Timeout._onTimeout (C:\Projects\Tmp\ng-karma-test\node_modules\karma\lib\browser.js:166:17)
[1]     at tryOnTimeout (timers.js:232:11)
[1]     at Timer.listOnTimeout (timers.js:202:5)
[1] karma start karma.conf.js exited with code 1

The number in quotes is different every time. If I reboot my PC the unit test runs again but also only one time and than the same error again.

Thanks.

PS: Bringing all packages to the latest version gives the following errors: node_modules/@types/jasmine/index.d.ts(73,9): error TS2375: Duplicate number index signature. node_modules/@types/jasmine/index.d.ts(127,9): error TS2374: Duplicate string index signature. node_modules/@types/node/index.d.ts(99,6): error TS2300: Duplicate identifier 'BufferEncoding'. node_modules/@types/node/index.d.ts(544,26): error TS2300: Duplicate identifier 'Buffer'. node_modules/@types/node/index.d.ts(544,50): error TS2300: Duplicate identifier 'SlowBuffer'. node_modules/@types/node/index.d.ts(565,18): error TS2300: Duplicate identifier 'EventEmitter'. node_modules/@types/node/index.d.ts(724,18): error TS2300: Duplicate identifier 'Agent'. node_modules/@types/node/index.d.ts(769,18): error TS2300: Duplicate identifier 'Worker'. node_modules/@types/node/index.d.ts(1070,18): error TS2300: Duplicate identifier 'Script'. node_modules/@types/node/index.d.ts(1912,18): error TS2300: Duplicate identifier 'TLSSocket'. node_modules/@types/node/index.d.ts(2203,18): error TS2300: Duplicate identifier 'Stream'. node_modules/@types/node/index.d.ts(2214,18): error TS2300: Duplicate identifier 'Readable'. node_modules/@types/node/index.d.ts(2237,18): error TS2300: Duplicate identifier 'Writable'. node_modules/@types/node/index.d.ts(2255,18): error TS2300: Duplicate identifier 'Duplex'. node_modules/@types/node/index.d.ts(2276,18): error TS2300: Duplicate identifier 'Transform'. node_modules/@types/node/index.d.ts(2298,18): error TS2300: Duplicate identifier 'PassThrough'. node_modules/@types/node/index.d.ts(2369,5): error TS2300: Duplicate identifier 'export='. node_modules/@types/node/index.d.ts(2391,18): error TS2300: Duplicate identifier 'Domain'. typings/globals/node/index.d.ts(78,6): error TS2300: Duplicate identifier 'BufferEncoding'. typings/globals/node/index.d.ts(516,9): error TS2502: 'BuffType' is referenced directly or indirectly in its own type annotation. typings/globals/node/index.d.ts(517,9): error TS2502: 'SlowBuffType' is referenced directly or indirectly in its own type annotation. typings/globals/node/index.d.ts(518,26): error TS2300: Duplicate identifier 'Buffer'. typings/globals/node/index.d.ts(518,50): error TS2300: Duplicate identifier 'SlowBuffer'. typings/globals/node/index.d.ts(539,18): error TS2300: Duplicate identifier 'EventEmitter'. typings/globals/node/index.d.ts(698,18): error TS2300: Duplicate identifier 'Agent'. typings/globals/node/index.d.ts(743,18): error TS2300: Duplicate identifier 'Worker'. typings/globals/node/index.d.ts(1044,18): error TS2300: Duplicate identifier 'Script'. typings/globals/node/index.d.ts(1886,18): error TS2300: Duplicate identifier 'TLSSocket'. typings/globals/node/index.d.ts(2177,18): error TS2300: Duplicate identifier 'Stream'. typings/globals/node/index.d.ts(2188,18): error TS2300: Duplicate identifier 'Readable'. typings/globals/node/index.d.ts(2211,18): error TS2300: Duplicate identifier 'Writable'. typings/globals/node/index.d.ts(2229,18): error TS2300: Duplicate identifier 'Duplex'. typings/globals/node/index.d.ts(2250,18): error TS2300: Duplicate identifier 'Transform'. typings/globals/node/index.d.ts(2272,18): error TS2300: Duplicate identifier 'PassThrough'. typings/globals/node/index.d.ts(2343,5): error TS2300: Duplicate identifier 'export='. typings/globals/node/index.d.ts(2365,18): error TS2300: Duplicate identifier 'Domain'. npm ERR! Test failed. See above for more details.