Poller.php crashing and impacting backend

Everything was running fine until it was time to upgrade php from 7.2 to 7.4. I was tired of the deprecation warnings.

I upgraded php to 7.4 and found out I had to upgrade mariadb too. I had a few issues with the migration but in the end, it worked.

Then I started to get ‘SWITCH DOWN’ alerts with no host information. Just blank template emails. We’re talking thousands. I only have about 400 devices in librenms.

Then I would see “Problem with backend” in my dashboards. I would tail the librenms.log and it happens right after this error:

[2021-06-18 11:25:15] production.ERROR: Cannot use object of type stdClass as array {“exception”:"[object] (Error(code: 0): Cannot use object of type stdClass as array at /opt/librenms/poller.php:133)
#0 {main}

Is my database corrupted? What gives?

Component | Version
--------- | -------
LibreNMS  | 21.5.1-28-g69397ea70
DB Schema | 2021_25_01_0127_create_isis_adjacencies_table (209)
PHP       | 7.4.20
Python    | 3.6.9
MySQL     | 10.3.29-MariaDB-1:10.3.29+maria~bionic
RRDTool   | 1.7.0
SNMP      | NET-SNMP 5.7.3

[OK]    Composer Version: 2.1.3
[OK]    Dependencies up-to-date.
[OK]    Database connection successful
[OK]    Database schema correct

Updating to latest codebase                        OK
Updating Composer packages                         OK
Updating SQL-Schema                                OK
Updating submodules                                OK
Cleaning up DB                                     OK
Fetching notifications                             OK
Caching PeeringDB data                             OK
Caching Mac OUI data                               OK

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