🐛 Error raised by frontend Map component if no stop found

frontend/src/stopsSearchMenu/map.tsx

@@ -116,8 +116,10 @@ export const Map: ParentComponent<{}> = () => {
 		const foundStopIds = new Set();
 		for (const foundStop of stops) {
 			foundStopIds.add(foundStop.id);
+			if (foundStop.stops !== undefined) {
 				foundStop.stops.forEach(s => foundStopIds.add(s.id));
 			}
+		}
 
 		for (const [stopIdStr, feature] of Object.entries(displayedFeatures)) {
 			const stopId = parseInt(stopIdStr);