Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2):17.0.3
Operating system and version (eg, Ubuntu 17.04):Ubuntu 18.04.3 LTS
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.41 (Ubuntu)
PHP version (eg, 7.1):PHP 7.3.10
Web browser is Firefox
The issue you are facing:
I created a new user as admin on the web based UI, left clicked quota button for it to only dissapear immediately.
The only way to keep that open long enough is to right click and escape out of browser dialogue box…
Is this the first time you’ve seen this error? (Y/N): Yes, since upgrading.