This check is to see if the processed PVO is for the master privilege (PRIV:<REP>:ONLY) which has the attribute MX_IS_ACCOUNT set. If you have privileges running through this workflow and into the false node you probably have them set up without the master privilege reference (MX_REQ_PRIV).
The master privilege should have been set by the initial load jobs. You can start by checking the privileges and make sure they have the MX_REQ_PRIV set correctly, and if not, check your initial load jobs to see why not. If you've created the privileges outside the initial load you need to make sure they include a reference to the repositorys master privilege.
Br,
Chris