PHP Warning generated

Using PHP 7.3, WP and all plugins up to date:

PHP Warning: A non-numeric value encountered in /var/www/vhosts/example.com/httpdocs/wp-content/plugins/wp-crontrol/src/schedule.php on line 62

Tip: There is one time plan (sorry, translating German) called “tpm_interval” (TPM Token Refresh Interval) for which you report: Dieses Intervall ist kleiner als die Konstante WP_CRON_LOCK_TIMEOUT, die auf 60 gesetzt ist. Ereignisse, die es verwenden, werden möglicherweise nicht pünktlich ausgeführt. (This interval is smaller than the constant WP_CRON_LOCK_TIMEOUT, which is set to 60. Events that use it may not execute on time.)

And some events like “wpseo-reindex-links”, “aioseop_cron_check_remote_notices” and “itsec_purge_logs” for which you report that no action is registered. Perhaps the problem is in such irregular cases?

The error message comes quite often, so for now am deactivating WP Crontrol – after all, we only need it sometimes. But when we do, it’s really indispensible – many thanks, John!

Tim