diff --git a/REST/old/app.py b/REST/old/app.py
index 0d25889..ddd96db 100644
--- a/REST/old/app.py
+++ b/REST/old/app.py
@@ -50,7 +50,8 @@ def get_random_numbers():
     
     if not initialized:
         return create_response(432, 'System not ready; try init')
-
+    
+    with lock:  # Sperre (Lock) verwenden, um sicherzustellen, dass nur ein Thread die Methode ausführt
     random_numbers = analyze_data(int(quantity), int(bits), startup=False)    
             
     if random_numbers == 400: