The user list is not displayed.

Nextcloud version (eg, 12.0.2):
Operating system and version (eg, Ubuntu 17.04): CentOS 7.2
Apache or nginx version (eg, Apache 2.4.25): nginx
PHP version (eg, 7.1): 7.1.24

The issue you are facing: Nothing is displayed on the user list link in the upper right.

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

It occurred before it happened.
I do not remember the cause.