diff --git a/src/Model/BoundaryConditionsAdisTS/BoundaryConditionAdisTS.py b/src/Model/BoundaryConditionsAdisTS/BoundaryConditionAdisTS.py
index 408e44a8..fe047c5a 100644
--- a/src/Model/BoundaryConditionsAdisTS/BoundaryConditionAdisTS.py
+++ b/src/Model/BoundaryConditionsAdisTS/BoundaryConditionAdisTS.py
@@ -300,6 +300,11 @@ class BoundaryConditionAdisTS(SQLSubModel):
             if pol_id == -1:
                 continue
 
+            if pol_id not in pid_pol:
+                # ⚠️ cas important : probablement déjà migré
+                print(f"[WARN] pol_id {pol_id} not in pid_pol → probably already migrated")
+                continue
+
             execute(
                 f"UPDATE boundary_condition_adists " +
                 f"SET pollutant = {pid_pol[pol_id]} " +
diff --git a/src/Model/Tools/PamhyrDB.py b/src/Model/Tools/PamhyrDB.py
index 0a55cce5..265876f9 100644
--- a/src/Model/Tools/PamhyrDB.py
+++ b/src/Model/Tools/PamhyrDB.py
@@ -311,6 +311,11 @@ class SQLSubModel(PamhyrID):
             if node_id == -1:
                 continue
 
+            if node_id not in nodes:
+                # ⚠️ cas important : probablement déjà migré
+                print(f"[WARN] node_id {node_id} not in nodes → probably already migrated")
+                continue
+
             execute(
                 f"UPDATE {table} " +
                 f"SET node = {nodes[node_id]} " +