bin2hex(): Passing null to parameter #1 ($string) of type string is deprecated

[deric]

Deprecated: bin2hex(): Passing null to parameter #1 ($string) of type string is deprecated in /usr/share/icingaweb2/modules/icingadb/library/Icingadb/Redis/VolatileStateResults.php on line 135

relevant part of code:

134             if ($type === 'service' && $row->host instanceof Host) {
135                 $hostStates[bin2hex($row->host->id)] = $row->host->state;
136                 if (empty($hostStateKeys)) {
137                     $hostStateKeys = $row->host->state->getColumns();
138                 }
139             }

To Reproduce

1. Load data from redis
2. Open icingaweb

Expected behavior

Don't show deprecation warnings

Your Environment

• Icinga DB Web version (System - About):
• Icinga Web 2 version (System - About): 2.12.1
• Icinga 2 version (icinga2 --version): r2.14.1-1
• Icinga DB version (icingadb --version): v1.1.1
• PHP version used (php --version): 8.2.7