compiled bundle moduleId is null

Bug report

What is the current behavior?
my problem happens on vue ssr project。by config webpack,new webpack instance and start by webpack-dev-server,the output dectory bundle.js,in this js file,moduleId is null

If the current behavior is a bug, please provide the steps to reproduce.
1、normal webpack config
2、new webpack instance
3、instacnce watch
4、the output bundle , moduleId is null

this is the output code,like this:
// null:
/
/ (function(module, exports, webpack_require) {
/***/ }),

What is the expected behavior?
module have right moduleId

Other relevant information:
webpack version: 3.12.0
Node.js version: 8.9.4
Operating System: win 10
Additional tools: webstorm

Author: Fantashit

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