Popover removeEventListener error in beforeDestroy

[jesus]

Hi:
I found that using several routes sometimes in the switching I get:

vue.runtime.esm.js?0500:1443 TypeError: Cannot read property ‘removeEventListener’ of undefined
at VueComponent.beforeDestroy (eval at <anonymous>

If I change in Popover.js source in beforeDestroy() :

  if (this.anchorClick) { .... 

to

  if (this.anchorClick && this.anchorEl) { ... 

Everything works fine. Could you be so kind to commit this fix ?

[rstoenescu]

Pushed. Use the edge version until v0.13.7 or v0.14 is released.
Many thanks for investigating and also providing the solution!