Getting "problem with backend" error with top devices/top interface widgets

Hi folks,

So for some reason I get “problem with backend” when I try to bring up either the Top Devices or Top Interface widgets.

bash-4.2$ /opt/librenms/validate.php

Component Version
LibreNMS 1.49-94-g96797aa
DB Schema 2019_02_10_220000_add_dates_to_fdb (132)
PHP 7.2.14
MySQL 5.5.60-MariaDB
RRDTool 1.4.8


[OK] Composer Version: 1.8.4
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct
[WARN] Some devices have not been polled in the last 5 minutes. You may have performance issues.
Check your poll log and see:

[WARN] IPv6 is disabled on your server, you will not be able to add IPv6 devices.

bash-4.2$ ./
Updating to latest codebase OK
Updating Composer packages OK
Updated from f520933 to 96797aa OK
Updating SQL-Schema OK
Updating submodules OK
Cleaning up DB OK
Fetching notifications OK
Caching PeeringDB data OK

I saw some previous threads on this that seemed to relate to specific older branches of the code. Any idea what is going on?

So the problem comes and goes.

I’m also having the issue. No problems in validate.php. Hopefully I find the time to look into this.