diff --git a/tests/test_logging.py b/tests/test_logging.py
index 6fd05cc..e515747 100644
--- a/tests/test_logging.py
+++ b/tests/test_logging.py
@@ -1,3 +1,5 @@
+from typing import Any
+from diceutils.exceptions import TooManyLoggersError
 from diceutils.logging import Logger
 
 import pytest
@@ -86,3 +88,31 @@ def test_clear(logger):
     assert logger.load("0", "0") == []
     assert logger.loadall() == {}
     logger.rescue()
+
+
+def test_multiple(logger):
+    session_id = "0"
+    for i in range(3):
+        logger.add(
+            session_id,
+            i,
+            user_id="0",
+            user_role="KP",
+            data=[{"type": "text"}],
+            message_sequence="xxx",
+        )
+
+    try:
+        logger.add(
+            session_id,
+            3,
+            user_id="0",
+            user_role="KP",
+            data=[{"type": "text"}],
+            message_sequence="xxx",
+        )
+        exception = None
+    except Exception as err:
+        exception = err
+
+    assert isinstance(exception, TooManyLoggersError)