main.CRITICAL: Error: Call to a member function isVirtual() on null

I am having this strange error filling my cron logs:

main.CRITICAL: Error: Call to a member function isVirtual() on null

from file

magento/module-sales-rule/Model/Rule/Condition/Address.php line 177

I can’t figure out from where it is coming.

Any help please how to look for?

Thanks