angular-cli: Webpack rebuild error

OS?

Ubuntu 16.04

Versions

angular-cli: 1.0.0-beta.28.3 node: 7.4.0 os: linux x64 @angular/common: 2.4.5 @angular/compiler: 2.4.5 @angular/core: 2.4.5 @angular/forms: 2.4.5 @angular/http: 2.4.5 @angular/platform-browser: 2.4.5 @angular/platform-browser-dynamic: 2.4.5 @angular/router: 3.4.5 @angular/compiler-cli: 2.4.5

Repro steps.

Created the app with the angular-cli (ng new). Ran ng serve to make sure everything was working. All was good, webpack worked and reported:

Hash: 7a95e8c73d53b9f210c7                    
Time: 8041ms
chunk    {0} main.bundle.js, main.bundle.map (main) 17.2 kB {3} [initial] [rendered]
chunk    {1} styles.bundle.js, styles.bundle.map (styles) 205 kB {4} [initial] [rendered]
chunk    {2} scripts.bundle.js, scripts.bundle.map (scripts) 375 kB {4} [initial] [rendered]
chunk    {3} vendor.bundle.js, vendor.bundle.map (vendor) 2.83 MB [initial] [rendered]
chunk    {4} inline.bundle.js, inline.bundle.map (inline) 0 bytes [entry] [rendered]
webpack: Compiled successfully.

I was able to load the app in a browser. Made a small change to the app.component.ts file (removed the trailing new line). Saved the file, webpack attempted to re-bundle the file, but failed.

The log given by the failure.

Hash: 7a95e8c73d53b9f210c7                
Time: 613ms
chunk    {0} main.bundle.js, main.bundle.map (main) 17.2 kB {3} [initial]
chunk    {1} styles.bundle.js, styles.bundle.map (styles) 205 kB {4} [initial]
chunk    {2} scripts.bundle.js, scripts.bundle.map (scripts) 375 kB {4} [initial]
chunk    {3} vendor.bundle.js, vendor.bundle.map (vendor) 2.83 MB [initial]
chunk    {4} inline.bundle.js, inline.bundle.map (inline) 0 bytes [entry]

ERROR in Cannot read property 'length' of undefined
webpack: Failed to compile.