Cloudlog: [PHP 8.1] "Passing null to parameter #1 ($datetime) of type string is deprecated" errors while searching in logbook

Describe the bug When I search for log entries I often get this PHP error where the ‘Uploaded to LoTW’ arrow is seen:

A PHP Error was encountered

Severity: 8192

Message: strtotime(): Passing null to parameter #1 ($datetime) of type string is deprecated

Filename: partial/log_ajax.php

Line Number: 200
data-original-title="LoTW Sent " data-toggle="tooltip" class="lotw-green">

To Reproduce Steps to reproduce the behaviour:

1. Search for (part of) callsign.
2. Scroll down until error is seen.
3. White “Uploaded to LoTW” arrow is seen with PHP error above.

Expected behaviour No error and green up arrow. Looking into QSO data, the COL_LOTW_QSLRDATE has a valid date and COL_LOTW_QSL_RCVD is ‘Y’.

Screenshots

Server OS: FreeBSD 13.1 Server: nginx/1.22.1 PHP: 8.1.13 Git branch: dev Git commit: 04e99607 Git Tag: 2.1-94-g04e99607