diff --git a/ingestor/managers/ingestor_manager.py b/ingestor/managers/ingestor_manager.py
index 187a234..462cb3e 100644
--- a/ingestor/managers/ingestor_manager.py
+++ b/ingestor/managers/ingestor_manager.py
@@ -145,7 +145,8 @@ class IngestorManager():
         """
         Checks the integrity of the OPC servers and updates the OPC servers if necessary.
         """
-        for server, opc_manager in self.opc_managers.items():
+        current_managers = self.opc_managers.copy()
+        for server, opc_manager in current_managers.items():
             opc_manager.check_cycles()
 
             is_lost = opc_manager.check_opc_listenning()