diff --git a/src/Model/River.py b/src/Model/River.py
index 1bc54e2d..9969f427 100644
--- a/src/Model/River.py
+++ b/src/Model/River.py
@@ -475,59 +475,78 @@ class River(Graph):
             execute, data
         )
         data["stricklers"] = new._stricklers
+        data['loaded_pid'] = set()
 
         # Initial conditions
         new._sediment_layers = SedimentLayerList._db_load(
             execute, data
         )
         data["sediment_layers_list"] = new._sediment_layers
+        data['loaded_pid'] = set()
 
         # Network
         new._nodes = RiverNode._db_load(
             execute, data
         )
         data["nodes"] = new.nodes()
+        data['loaded_pid'] = set()
 
         new._edges = RiverReach._db_load(
             execute, data
         )
         data["edges"] = new.edges()
+        data['loaded_pid'] = set()
 
         # Boundary Condition
         new._boundary_condition = BoundaryConditionList._db_load(
             execute, data
         )
+
+        data['loaded_pid'] = set()
+
         # Lateral Contribution
         new._lateral_contribution = LateralContributionList._db_load(
             execute, data
         )
 
+        data['loaded_pid'] = set()
+
         # Initial conditions
         new._initial_conditions = InitialConditionsDict._db_load(
             execute, data
         )
 
+        data['loaded_pid'] = set()
+
         # Reservoir
         new._reservoir = ReservoirList._db_load(
             execute, data
         )
 
+        data['loaded_pid'] = set()
+
         # Hydraulic Structures
         new._hydraulic_structures = HydraulicStructureList._db_load(
             execute, data
         )
 
+        data['loaded_pid'] = set()
+
         # Parameters
         new._parameters = SolverParametersList._db_load(
             execute, data
         )
 
+        data['loaded_pid'] = set()
+
         # Additional Files
         new._additional_files = AddFileList._db_load(
             execute, data
         )
         new._rep_lines = REPLineList._db_load(execute, data)
 
+        data['loaded_pid'] = set()
+
         new._Output_rk_adists = OutputRKAdistsList._db_load(
             execute, data
         )