Error in Active Directory account aggregation (could not initialize proxy - no Session)

We are receiving following error in Active Directory account aggregation. We are currently running IdentityIQ version 8.3p1.
Reason: failed to lazily initialize a collection of role: sailpoint.object.Rule.referencedRules, could not initialize proxy - no Session

We have recently introduced some IdentitySelector roles to the system, and we have some doubts that these roles may cause the error. These rules are pretty standard, they only check some Identity attributes and check that user has specific accounts ready with following function. IdentitySelector rules are working fine and they are assigning roles to identities.

Has anyone else experienced similar issue? Could there be correlation between these IdentitySelector rules and the Active Directory account aggregation. We would like to understand the root cause for the error in the aggregation