Material-ui: Beta website get crash when lick on the same link again.

[vothanhdat]

• [x] I have searched the issues of this repository and believe that this is not a duplicate.

Steps to Reproduce (for bugs)

1. Go to https://material-ui-next.com, click on any menu link
   

   1. Click on the same link link again
      

and website get crash.

Environment

| Tech | Version |
|--------------|---------|
| Material-UI | v1.0.0-beta.40 |
| browser | Chrome 65 |

[mbrookes]

Looks like the same issue that affects HMR in development.

[solkaz]

I am experiencing the same issue, but have a different error:

Tech | Version
-- | --
Material-UI | v1.0.0-beta.40
browser | Firefox Developer Edition 60.0b10

t.uiTheme is undefined
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:393480
f@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:85736
updateClassInstance@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:89160
beginWork@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:99380
a@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:116024
o@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:116299
x@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:119288
y@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:118830
g@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:118667
v@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:118041
l@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:117495
t@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:123006
updateContainer@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:123650
module.exports</Ba.prototype.render@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:138465
Ka@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:144210
render@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:144945
ae@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:328157
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:325139
d@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:329085
a@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:331055
O/</e[t]@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:329598
n@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188833
module.exports</t.default/</<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188984
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:338899
module.exports</t.default/<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188779
t@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:325327
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:323674
d@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:329085
a@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:331055
O/</e[t]@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:329598
n@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188833
module.exports</t.default/</<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188984
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:338899
module.exports</t.default/<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188779
t@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:323911
e/<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:327809
e/<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:362209
module.exports</e.exports/</<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:264473
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:362163
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:359378
e@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:357483
d@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:329085
a@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:331055
O/</e[t]@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:329598
n@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188833
n/<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:188932
i@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:337735
M/<@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:337892
l@https://material-ui-next.com/_next/17209432-ff2f-483f-8227-da1fb2e0d12c/main.js:1:340841



    in Connect(t)
    in r
    in r
    in t
    in t main.js:1:324172

[oliviertassinari]

As you can see, the issue is solved on HEAD: https://material-ui-next.netlify.com/.