diff --git a/app/routers/views.py b/app/routers/views.py
index aeb2398..2c89f1c 100644
--- a/app/routers/views.py
+++ b/app/routers/views.py
@@ -73,12 +73,20 @@ async def _fetch_trips(vehicle_id: int, day: date) -> dict[str, Any]:
         # Continuous day track (GeoJSON LineString of every fix, in order) so the
         # frontend can draw one unbroken route under the per-trip coloured
         # segments — trip splits on reporting gaps no longer look like the
-        # vehicle teleported.
+        # vehicle teleported. Guarded by an existence check so the endpoint keeps
+        # working if the code is deployed before migration 24 lands.
+        track: Any = None
         await cur.execute(
-            "SELECT serve.fn_vehicle_day_track(%s, %s)", (vehicle_id, day)
+            "SELECT to_regprocedure('serve.fn_vehicle_day_track(bigint, date)') IS NOT NULL"
         )
-        track_row = await cur.fetchone()
-    payload["day_track"] = track_row[0] if track_row and track_row[0] is not None else None
+        exists_row = await cur.fetchone()
+        if exists_row and exists_row[0]:
+            await cur.execute(
+                "SELECT serve.fn_vehicle_day_track(%s, %s)", (vehicle_id, day)
+            )
+            track_row = await cur.fetchone()
+            track = track_row[0] if track_row else None
+    payload["day_track"] = track
     return payload