diff --git a/enrich-etab.ini b/enrich-etab.ini
index 6dc239b..f8f61f8 100644
--- a/enrich-etab.ini
+++ b/enrich-etab.ini
@@ -22,7 +22,6 @@
 # Concaténation des sigles et libellés des établissements associés
 [assign]
 path = ws.etab
-; value = get('ws.rnsr', []).map(structs => structs.map(struct => `${struct.sigle}: ${struct.intitule}`)).flatten()
 value = get('ws.rnsr', []).map(structs => Array.isArray(structs) ? structs.map(struct => `${struct.sigle}: ${struct.intitule}`) : []).flatten()
 
 # Save data
diff --git a/enrich-institutes.ini b/enrich-institutes.ini
index 9135421..bc463f8 100644
--- a/enrich-institutes.ini
+++ b/enrich-institutes.ini
@@ -24,7 +24,7 @@
 
 [assign]
 path = ws.rnsr_id
-value = get("ws.rnsr").map(structs => structs.map(struct => struct.num_nat_struct)).flatten()
+value = get("ws.rnsr").map(structs => Array.isArray(structs) ? structs.map(struct => struct.num_nat_struct) : "n/a").filter((id) => id !== "n/a").flatten()
 
 [assign]
 path = ws.instituts