str_replace() is deprecated

[peta3000]

I get the following debug message:

Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /var/www/html/report/customsql/locallib.php on line 510

I also get the
Deprecated: Function strftime() is deprecated in /var/www/html/report/customsql/locallib.php on line 204
--> also reported here, in context of a cron-issue: #143

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Moodle-Release/Build/Version: Moodle 4.1.6 (Build: 20231009)
Plugin-Release/Build/Version: 4.2 for Moodle 3.9+ (Build: 2022031800)
Theme Boost Version: 2022112800

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Many thanks!

[abias]

I think the second problem of this issue was solved by a97a9e5.