Terminated error line 955

[drageloth]

Hello,
A friend of mine has a problem where his monitor died after 2-3 days of running. He's running raspbian on a pi 4 along with donker containing Hassos etc. Error is

monitor.sh : line 955 : 164535524RSLAL: value too great for base (error token is "164535524RSLAL")
terminated

Line 955 refers to instruction_delay with a timestamp.
Can anyone elaborate on that?
I thought about telling him to have a cronjob to restart every day like I have on mine and works, but his OS has many things inside including his smart home, making this impossible without long downtime.