diff --git a/.secrets.baseline b/.secrets.baseline
index 7cb5390..6ea4938 100644
--- a/.secrets.baseline
+++ b/.secrets.baseline
@@ -156,7 +156,7 @@
         "filename": "tests/unit/test_caldav_gateway.py",
         "hashed_secret": "1c58bd92003bbaa0538e249fff6ee19a270dec5f",
         "is_verified": false,
-        "line_number": 763
+        "line_number": 794
       }
     ],
     "tests/unit/test_caldav_security.py": [
@@ -185,5 +185,5 @@
       }
     ]
   },
-  "generated_at": "2026-09-12T17:57:39Z"
+  "generated_at": "2026-09-12T22:12:56Z"
 }
diff --git a/pronote_sync/sync/caldav.py b/pronote_sync/sync/caldav.py
index 5ad6c60..4839a3d 100644
--- a/pronote_sync/sync/caldav.py
+++ b/pronote_sync/sync/caldav.py
@@ -191,7 +191,11 @@ class CalDAVGateway:
                 for vevent in component.walk("VEVENT"):
                     managed = vevent.get(MANAGED_PROPERTY)
                     if managed is not None and str(managed) == MANAGED_VALUE:
-                        raw_uid = str(vevent.get("UID"))
+                        raw_uid_value = vevent.get("UID")
+                        if raw_uid_value is None or not str(raw_uid_value).strip():
+                            logger.warning("Événement CalDAV géré sans UID ignoré.")
+                            continue
+                        raw_uid = str(raw_uid_value)
                         canonical_uid = normalize_pronote_uid(raw_uid)
                         result.append((raw_uid, canonical_uid, vevent))
         except Exception as exc:
diff --git a/tests/unit/test_caldav_gateway.py b/tests/unit/test_caldav_gateway.py
index f6088a4..abcbd27 100644
--- a/tests/unit/test_caldav_gateway.py
+++ b/tests/unit/test_caldav_gateway.py
@@ -327,6 +327,37 @@ def test_list_managed_events_returns_only_managed(
     assert str(vevent.get("UID")) == "test-uid-123"
 
 
+def test_list_managed_events_ignores_managed_event_without_uid(
+    caldav_settings: CalDAVSettings,
+    mock_client_factory: MagicMock,
+    caplog: LogCaptureFixture,
+) -> None:
+    """Ignore un événement géré sans UID et ne le transmet pas au planificateur.
+
+    :param caldav_settings: Paramètres CalDAV valides.
+    :param mock_client_factory: Usine de clients CalDAV mockée.
+    :param caplog: Capture des journaux de diagnostic.
+    :return: None
+    """
+    gateway = CalDAVGateway(caldav_settings, client_factory=mock_client_factory)
+    gateway.connect()
+
+    malformed_event = Event()
+    malformed_event.add("SUMMARY", "Événement sans identifiant")
+    malformed_event.add(MANAGED_PROPERTY, MANAGED_VALUE)
+    remote_event = MagicMock()
+    remote_event.icalendar_component = Calendar()
+    remote_event.icalendar_component.add_component(malformed_event)
+    calendar = mock_client_factory.return_value.principal.return_value.calendars.return_value[0]
+    calendar.search.return_value = [remote_event]
+
+    with caplog.at_level(logging.WARNING):
+        result = gateway.list_managed_events(datetime(2026, 1, 1), datetime(2026, 12, 31))
+
+    assert result == []
+    assert "sans UID ignoré" in caplog.text
+
+
 def test_list_managed_events_not_connected_raises(
     caldav_settings: CalDAVSettings,
 ) -> None: