Unable to process action set

Hi Folks,
I’ve been seeing the following intermittent error over the past few days. It’s a new error in a 7 year old application
2021-01-13 12:32:01 - CRIT --> [Unexpected]Unable to process action set
At that point, the program is attempting a contact update:
$application->getApp()->updateCon($application->getContactId(),
array("Company" => $contact["Company"],
"AccountId" => $contact["CompanyID"],
"CompanyID" => $contact["CompanyID"]));