CRON STOPPED

Hello, my QTOR instance is no longer sending emails. After checking, I found that my cron job is stopping despite restarting the PHP server. The logs are below. I'm using version 11.3.1. What approach do you recommend?
2025-12-11 16:01:27.742 ***** ERROR ***** [V11.3.1] CRON abnormally stopped
2025-12-11 16:01:27.742 ***** ERROR ***** [V11.3.1] === Trace Stack for last error ===
2025-12-11 16:01:27.742 ***** ERROR ***** [V11.3.1] => /var/www/html/projeqtor/model/Cron.php at line 321 calling debugPrintTraceStack()
2025-12-11 16:01:27.742 ***** ERROR ***** [V11.3.1] => /var/www/html/projeqtor/tool/cronRun.php at line 35 calling Cron:abort()
2025-12-11 16:01:27.742 ***** ERROR ***** [V11.3.1] => calling cronAbort()
2025-12-11 16:01:27.742 ***** ERROR ***** [V11.3.1] ===