Version

3.5.1

Reproduction link

https://jsfiddle.net/xkLh4njp/

Steps to reproduce

1. Create a Vuex store.
2. Call store.hasModule() with an array of at least 2 elements where neither module has been registered to the store.

What is expected?

store.hasModule() to return false

What is actually happening?

Error "TypeError: Cannot read property 'hasChild' of undefined" is thrown