"TypeError: Cannot read property 'getSupportedExtensions' of null" when submitting login (linux)

Description of the issue:

I am trying to log into my banking website (53.com). After entering my username/password and submitting, the login box hangs. In the console I see this error:

TypeError: Cannot read property 'getSupportedExtensions' of null
    at eval (eval at globalEval (patternlab.js:335), <anonymous>:1:13629)
    at Object.u.logonToRob (eval at globalEval (patternlab.js:335), <anonymous>:1:16360)
    at HTMLFormElement.onsubmit (wealth-management.html:1)
u.logonToRob @ VM1105:1
onsubmit @ wealth-management.html:1

How can this issue be reproduced?

  1. Navigate the 53.com
  2. Enter username and password
  3. Open console
  4. Click submit
  5. The error noted above should appear in the console and the login box will appear to be loading (3 blinking dots) but never finish.

Expected result:

The login should proceed without error into the user account dashboard.

Brave Version( check About Brave):

1.5.123 Chromium 80.0.3987.163-1 64 bit (Linux)

Additional Information:

This error happens with and without shields as well as without any extensions (3rd party and builtin) enabled. The error does not happen for the matching Brave version in Windows as well as the matching Chromium build in Linux (80.0.3987.163-1) and thus appears to be a Linux-specific Brave issue.

The distribution is Arch Linux.

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