diff --git a/openair2/RRC/NR/rrc_gNB.c b/openair2/RRC/NR/rrc_gNB.c
index 8f4a3a3a4d..81a17afab1 100644
--- a/openair2/RRC/NR/rrc_gNB.c
+++ b/openair2/RRC/NR/rrc_gNB.c
@@ -496,6 +496,7 @@ static void rrc_gNB_generate_defaultRRCReconfiguration(const protocol_ctxt_t *co
 
   /******************** Radio Bearer Config ********************/
   gNB_RRC_UE_t *ue_p = &ue_context_pP->ue_context;
+  AssertFatal(ue_p->nb_of_pdusessions == 0, "logic bug: PDU sessions present before RRC Connection established\n");
 
   struct NR_RRCReconfiguration_v1530_IEs__dedicatedNAS_MessageList *dedicatedNAS_MessageList = CALLOC(1, sizeof(*dedicatedNAS_MessageList));