diff --git a/web/assets/js/main.js b/web/assets/js/main.js
index cbd5db4..c57975f 100644
--- a/web/assets/js/main.js
+++ b/web/assets/js/main.js
@@ -55,15 +55,15 @@ async function updateStatus() {
 
 async function update() {
 	if (null === cursong_startat)
-		return false;
+		return -1;
 
 	const estimate = (new Date()) - (new Date(cursong_startat));
 	if (estimate >= cursong_duration_msec) {
-		return false;
+		return 1;
 	}
 
 	$("radio-duration-estimate").textContent = `${formatDuration(new Date(estimate))} / `;
-	return true;
+	return 0;
 }
 
 $("radio-update").addEventListener("click", async () =>
@@ -72,11 +72,15 @@ $("radio-update").addEventListener("click", async () =>
 
 let update_interval_id = null;
 async function interval() {
-	if (!await update()) {
-		clearInterval(update_interval_id);
-		await new Promise(resolve => setTimeout(resolve, 5000));
-		[cursong_duration_msec, cursong_startat] = await updateStatus();
-		update_interval_id = setInterval(interval, 1000);
+	switch (await update()) {
+		case 1:
+			[cursong_duration_msec, cursong_startat] = await updateStatus();
+			break;
+		case -1:
+			clearInterval(update_interval_id);
+			await new Promise(resolve => setTimeout(resolve, 5000));
+			[cursong_duration_msec, cursong_startat] = await updateStatus();
+			update_interval_id = setInterval(interval, 1000);
 	}
 }