Vue does not check if ob is defined.

[AimForNaN]

Version

2.6.11

Reproduction link

https://jsfiddle.net/cdzos023/

Steps to reproduce

See fiddle.

---

Since upgrading to Vue 3 is not currently a viable option, I perform a small hack to make my class (which is a subclass of Array) reactive while maintaining its identity. This, however, results in an error when I try to call sort on it.

A simple fix could be checking if ob is defined before attempting to access any of its members.

vue/src/core/observer/array.js

Line 40 in e7cf063

if (inserted) ob.observeArray(inserted)

vue/src/core/observer/array.js

Line 42 in e7cf063

ob.dep.notify()

[posva]

Duplicate of #9259

[AimForNaN]

I can understand why this would be considered a duplicate of #9259, but the solution differs in extremity. I'm not asking to rewrite Vue 2. A simple if statement would overcome my issue.