diff --git a/src/Model/Reservoir/Reservoir.py b/src/Model/Reservoir/Reservoir.py
index 1d1998b6..c093691c 100644
--- a/src/Model/Reservoir/Reservoir.py
+++ b/src/Model/Reservoir/Reservoir.py
@@ -310,7 +310,7 @@ class Reservoir(SQLSubModel):
                 new_reservoir.set_as_deleted()
 
             new_reservoir._node = None
-            if node_id != -1:
+            if node_id != -1 and node_id is not None:
                 new_reservoir._node = next(
                     filter(
                         lambda n: n.id == node_id, data["nodes"]