diff --git a/src/pages/tableau.py b/src/pages/tableau.py
index 805dcb0..c6ef4f4 100644
--- a/src/pages/tableau.py
+++ b/src/pages/tableau.py
@@ -124,7 +124,11 @@ layout = [
                             "contentUrl": "https://www.data.gouv.fr/api/1/datasets/r/11cea8e8-df3e-4ed1-932b-781e2635e432",
                         },
                     ],
-                    "temporalCoverage": f"2018-01-01/{update_date_iso[:10]}",
+                    **(
+                        {"temporalCoverage": f"2018-01-01/{update_date_iso[:10]}"}
+                        if update_date_iso
+                        else {}
+                    ),
                     "spatialCoverage": {
                         "@type": "Place",
                         "address": {"countryCode": "FR"},
diff --git a/src/utils/data.py b/src/utils/data.py
index 811d7a7..58a9637 100644
--- a/src/utils/data.py
+++ b/src/utils/data.py
@@ -80,7 +80,12 @@ def _fetch_remote_schema(url: str | None) -> dict | None:
         return None
     try:
         raw = get(url, follow_redirects=True).raise_for_status().json()
-    except (httpx.HTTPError, httpx.TransportError, json.JSONDecodeError) as e:
+    except (
+        httpx.HTTPError,
+        httpx.TransportError,
+        httpx.TimeoutException,
+        json.JSONDecodeError,
+    ) as e:
         logger.error(f"Schéma distant indisponible ({url}) : {e}")
         return None
     return _validate_schema(raw)