title: Run Angular6 app with cli 1.7, get error Cannot read property 'config' of null
body: <p>Is it possible to run Angular6 project with cli 1.7? My current version are</p>
  
  <p>--</p>
  
  <p>Angular CLI: 1.7.4</p>
  
  <p>Node: 10.8.0</p>
  
  <p>OS: win32 x64</p>
  
  <p>Angular: 6.1.8</p>
  
  <p>--</p>
  
  <p>get this error message: </p>
  
  <pre><code>Cannot read property 'config' of null
  TypeError: Cannot read property 'config' of null
  
  at Class.run (C:\my-app\node_modules\@angular\cli\tasks\serve.js:51:63)
  at check_port_1.checkPort.then.port (C:\my-app\node_modules\@angular\cli\commands\serve.js:123:26)
  at process._tickCallback (internal/process/next_tick.js:68:7)
  </code></pre>
  
  <p>For some reason the deploy environment doesn't support node newer than 7 therefore not support angular-cli 6. But my app is build with angular 6. So I'm trying to find if there is any way to build angular app with angular-cli 1.7? Must angular 6 apps run with angular-cli 6 and node newer than 7? In other words, can I run angular 6 app without updating cli to 6?</p>