diff --git a/app/timetracking/backend/order_service.py b/app/timetracking/backend/order_service.py
index dbc8115..d657562 100644
--- a/app/timetracking/backend/order_service.py
+++ b/app/timetracking/backend/order_service.py
@@ -397,10 +397,15 @@ class OrderService:
         """Annuller en ordre"""
         try:
             # Check order exists and is not exported
-            order = execute_query(
+            order_result = execute_query(
                 "SELECT * FROM tmodule_orders WHERE id = %s",
                 (order_id,))
             
+            if not order_result:
+                raise HTTPException(status_code=404, detail="Order not found")
+            
+            order = order_result[0]
+            
             if not order:
                 raise HTTPException(status_code=404, detail="Order not found")
             
@@ -420,7 +425,7 @@ class OrderService:
             )
             
             # Reset time entries back to approved
-            lines = execute_query_single(
+            lines = execute_query(
                 "SELECT time_entry_ids FROM tmodule_order_lines WHERE order_id = %s",
                 (order_id,)
             )