title: Issue jHipster npm start
body: <p>I'm running a jhipster project in my MacBook Pro laptop (macOS Mojave v.10.14.4), when it finished of compiling successfully with npm start.</p>
  
  <p>It continues compiling many times without doing any change or modification to the code, it deploys the next error after a while:</p>
  
  <pre><code>DONE  Compiled successfully in 10362ms                              
  
  No type errors found
  Version: typescript 3.4.5
  Time: 54ms
  ℹ ｢wdm｣:    776 modules
  ℹ ｢wdm｣: Compiled successfully.
  /Volumes/KINGSTON 1/be4techbackend/node_modules/webpack-dev-server/lib/servers/SockJSServer.js:67
        f(connection, connection.headers);
                                 ^
  
  TypeError: Cannot read property 'headers' of null
      at Server.&lt;anonymous&gt; (/Volumes/KINGSTON 1/be4techbackend/node_modules/webpack-dev-server/lib/servers/SockJSServer.js:67:32)
      at Server.emit (events.js:311:20)
      at App.emit (/Volumes/KINGSTON 1/be4techbackend/node_modules/sockjs/lib/sockjs.js:196:29)
      at /Volumes/KINGSTON 1/be4techbackend/node_modules/sockjs/lib/transport.js:111:25
      at processTicksAndRejections (internal/process/task_queues.js:79:11)
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! be-4-tech-app-1@0.0.1-SNAPSHOT webpack-dev-server: `node --max_old_space_size=4096 node_modules/webpack-dev-server/bin/webpack-dev-server.js "--config" "webpack/webpack.dev.js" "--inline" "--hot" "--port=9060" "--watch-content-base" "--env.stats=minimal"`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the be-4-tech-app-1@0.0.1-SNAPSHOT webpack-dev-server script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /Users/victorhiguita/.npm/_logs/2020-03-04T00_58_49_205Z-debug.log
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! be-4-tech-app-1@0.0.1-SNAPSHOT webpack:dev: `npm run webpack-dev-server -- --config webpack/webpack.dev.js --inline --hot --port=9060 --watch-content-base --env.stats=minimal`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the be-4-tech-app-1@0.0.1-SNAPSHOT webpack:dev script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /Users/victorhiguita/.npm/_logs/2020-03-04T00_58_49_239Z-debug.log
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! be-4-tech-app-1@0.0.1-SNAPSHOT start: `npm run webpack:dev`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the be-4-tech-app-1@0.0.1-SNAPSHOT start script.
  npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
  
  npm ERR! A complete log of this run can be found in:
  npm ERR!     /Users/victorhiguita/.npm/_logs/2020-03-04T00_58_49_264Z-debug.log
  </code></pre>
  
  <p>Thanks for any clue.</p>