Menu component demo documentation crash on Edge 42

[arialpew]

Material-ui docs : https://material-ui.com/demos/

Menu component demo : https://material-ui.com/demos/menus/

Version : v1.1

Browser : Microsoft Edge 42.17134.1.0

When you go on Menu component demo, documentation crash and show error message :

"An unexpected error has occurred"

Stacktrace :

Invalid attempt to spread non-iterable instance
TypeError: Invalid attempt to spread non-iterable instance
   at r (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:438070)
   at i (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:43975)
   at e (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:646895)
   at e (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:646403)
   at commitLifeCycles (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:110047)
   at w (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:121715)
   at x (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:120501)
   at y (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:120033)
   at g (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:119870)
   at v (https://material-ui.com/_next/static/commons/main-a152ab07849ea9fef63e.js:1:119204)

Unable to get property 'firstChild' of undefined or null reference
...

CodeSandbox of first Menu example : https://codesandbox.io/s/5xv8x0mo54 (produces the same error, it's more serious than I thought. That comes from material-ui/core ?).

Stacktrace :

TypeError Invalid attempt to spread non-iterable instance
_nonIterableSpread (eval code:2:3)
_toConsumableArray (eval code:8:3)
resetTabIndex (eval code:159:7)
componentDidMount (eval code:122:7)
commitLifeCycles (eval code:14248:13)
commitAllLifeCycles (eval code:15342:7)
callCallback (eval code:100:9)

TypeError Unable to get property 'firstChild' of undefined or null reference
_this.getContentAnchorEl (eval code:77:9)
getContentAnchorOffset (eval code:273:9)
_this.getPositioningStyle (eval code:155:7)
_this.setPositioningStyles (eval code:137:9)
_this.handleEnter (eval code:221:7)
_this.handleEnter (eval code:100:9)
performEnter (eval code:265:5)
updateStatus (eval code:238:9)
componentDidMount (eval code:180:5)
commitLifeCycles (eval)

The above error occurred in the MenuList> component:
    in MenuList (created by Menu)
    in div (created by Paper)
    in Paper (created by WithStyles(Paper))
    in WithStyles(Paper) (created by Popover)
    in Transition (created by Grow)
    in Grow (created by WithTheme(Grow))
    in WithTheme(Grow) (created by Popover)
    in RootRef (created by Modal)
    in div (created by Modal)
    in Portal (created by Modal)
    in Modal (created by WithStyles(Modal))
    in WithStyles(Modal) (created by Popover)
    in Popover (created by WithStyles(Popover))
    in WithStyles(Popover) (created by Menu)
    in Menu (created by WithStyles(Menu))
    in WithStyles(Menu) (created by SimpleMenu)
    in div (created by SimpleMenu)
    in SimpleMenu

The above error occurred in the Transition> component:
    in Transition (created by Grow)
    in Grow (created by WithTheme(Grow))
    in WithTheme(Grow) (created by Popover)
    in RootRef (created by Modal)
    in div (created by Modal)
    in Portal (created by Modal)
    in Modal (created by WithStyles(Modal))
    in WithStyles(Modal) (created by Popover)
    in Popover (created by WithStyles(Popover))
    in WithStyles(Popover) (created by Menu)
    in Menu (created by WithStyles(Menu))
    in WithStyles(Menu) (created by SimpleMenu)
    in div (created by SimpleMenu)
    in SimpleMenu

Old version (like https://v1-0-0.material-ui.com/demos/menus/) doesn't have this issue.

[vudzero]

I confirm same issue here

[oliviertassinari]

My bandwidth yesterday was too slow to confirm this theory. The issue could be coming from:
https://github.com/mui-org/material-ui/blob/999d06fd8444213bb0f8aae279c4c20db363b45d/packages/material-ui/src/MenuList/MenuList.js#L109

[mbrookes]

@oliviertassinari spot on: