Yes, It's the same message
TypeError: Argument 1 passed to IPS\nexus\_Invoice::set_billaddress() must be an instance of IPS\GeoLocation, null given, called in /home/itlanfrhqk/www/system/Patterns/ActiveRecord.php on line 372 (0)
#0 /home/itlanfrhqk/www/system/Patterns/ActiveRecord.php(372): IPS\nexus\_Invoice->set_billaddress(NULL)
Not all "my clients" have invoice addresses, only invoiced customers have one.
Only customers who have purchased have a billing address.