diff --git a/server/src/forecast.mjs b/server/src/forecast.mjs
index 214578a..a5b3a77 100644
--- a/server/src/forecast.mjs
+++ b/server/src/forecast.mjs
@@ -223,8 +223,10 @@ function summarise(slots) {
 }
 
 export async function refreshForecast() {
-	const sensors = await queryCurrent()
-	const slots   = await get24HourForecast(sensors)
+	const sensors = await queryCurrent().catch(() => null)
+	if (!sensors) return cache
+	const slots   = await get24HourForecast(sensors).catch(() => null)
+	if (!slots) return cache
 	cache = { ts: Date.now(), slots, summary: summarise(slots) }
 	return cache
 }
diff --git a/server/src/server.mjs b/server/src/server.mjs
index 19918ca..ec3feaf 100644
--- a/server/src/server.mjs
+++ b/server/src/server.mjs
@@ -11,6 +11,7 @@ import {existsSync} from 'fs';
 import {getAirTraffic, getAirTrafficHistory, getShapes} from './airtraffic.mjs';
 import {getWeatherCondition} from './openweather.mjs';
 import {refreshForecast} from './forecast.mjs';
+import {cache} from 'express/lib/application.js';
 
 const app = express();
 const DIR = dirname(fileURLToPath(import.meta.url));
@@ -181,7 +182,14 @@ app.get('*', (req, res) => {
 
 // ── Start ─────────────────────────────────────────────────────────────────────
 
-setTimeout(refreshForecast, 2000)
+let ready = false
+while (!ready) {
+	try {
+		await refreshForecast()
+		ready = cache.slots.length > 0
+	} catch {}
+	if (!ready) await new Promise(r => setTimeout(r, 5000))
+}
 setInterval(refreshForecast, 10 * 60 * 1000)
 
 const c = cfg();