diff --git a/src/aeros_simulation/service.py b/src/aeros_simulation/service.py
index 43624df..d37cf7f 100644
--- a/src/aeros_simulation/service.py
+++ b/src/aeros_simulation/service.py
@@ -993,7 +993,7 @@ def convert_id_to_none_if_negative(value):
 async def create_simulation(*, db_session: DbSession, simulation_in: SimulationInput, current_user):
     """Create a new simulation."""
     input = simulation_in.model_dump(exclude={"SimulationName"})
-    user_id = current_user.get("user_id")
+    user_id = current_user.user_id
     
     # Check if is default
     if simulation_in.IsDefault: