diff --git a/capsulflask/hub_model.py b/capsulflask/hub_model.py
index c40cea4..478100c 100644
--- a/capsulflask/hub_model.py
+++ b/capsulflask/hub_model.py
@@ -91,7 +91,10 @@ class CapsulFlaskHub(VirtualizationInterface):
           pass
 
         if not result_has_valid_status: 
-          current_app.logger.error(f"""error reading assignment_status for operation {operation_id} from host {host.id}: 
+          operation_desc = ""
+          if operation_id:
+            operation_desc = f"for operation {operation_id}"
+          current_app.logger.error(f"""error reading assignment_status {operation_desc} from host {host.id}: 
               result_is_json: {result_is_json}
               result_is_dict: {result_is_dict}
               result_has_status: {result_has_status}
@@ -155,7 +158,6 @@ class CapsulFlaskHub(VirtualizationInterface):
             except:
               all_valid = False
           if not all_valid:
-            result_json_string = json.dumps({"error_message": "invalid capsul id returned"})
             current_app.logger.error(f"""error reading ids for list_ids operation, host {host.id}""")
         else:
             result_json_string = json.dumps({"error_message": "invalid response, missing 'ids' list"})
@@ -210,7 +212,7 @@ class CapsulFlaskHub(VirtualizationInterface):
     result_status = None
     host = get_model().host_of_capsul(id)
     if host is not None:
-      payload = json.dumps(dict(type="destroy", id=id))
+      payload = json.dumps(dict(type="destroy", email=email, id=id))
       results = self.synchronous_operation([host], payload)
       result_json_string = "<no response from host>"
       for result in results:
@@ -223,4 +225,4 @@ class CapsulFlaskHub(VirtualizationInterface):
           pass
 
     if not result_status == "success":
-      raise ValueError(f"""failed to destroy vm "{id}" on host "{host}" for {email}: {result_json_string}""")
+      raise ValueError(f"""failed to destroy vm "{id}" on host "{host.id}" for {email}: {result_json_string}""")