Since 5.0.0, breaks page with isBuffer is not a function.

[jaketoolson]

Version

5.0.0

Browser and OS info

Version 73.0.3683.86 (Official Build) (64-bit)

Steps to reproduce

Navigating my product's webpage (locally and in production) with vue tools, I get the following error:

 VM259:1 Uncaught TypeError: t.isBuffer is not a function
    at y (<anonymous>:1:2232)
    at f (<anonymous>:1:3275)
    at Object.<anonymous> (<anonymous>:1:928)
    at Object.r (<anonymous>:1:375)
    at Object.emit (<anonymous>:1:694)
    at t (vuex.min.js:6)
    at vuex.min.js:6
    at Array.forEach (<anonymous>)
    at new V (vuex.min.js:6)
    at Object.<anonymous> (app-74311e04b1.min.js:39)

Which points to the (minified) code:
if (g && t.isBuffer(e))

What is expected?

This shouldn't cause the web page I'm browsing to stop working.

What is actually happening?

Web page I'm using with vue-devtools enabled in the browser stops working entirely. If I disable the extension, the page/site loads just fine.

[Akryum]

Duplicate of #874