diff --git a/frontend/src/businessData.tsx b/frontend/src/businessData.tsx
index 81d7e4c..149aa44 100644
--- a/frontend/src/businessData.tsx
+++ b/frontend/src/businessData.tsx
@@ -21,7 +21,7 @@ export interface BusinessDataStore {
 	getStop: (stopId: number) => Stop | undefined;
 	searchStopByName: (name: string) => Promise<Stops>;
 
-	getStopDestinations: (stopId: number) => Promise<StopDestinations>;
+	getStopDestinations: (stopId: number) => Promise<StopDestinations | undefined>;
 	getStopShape: (stopId: number) => Promise<StopShape | undefined>;
 };
 
@@ -44,11 +44,22 @@ export function BusinessDataProvider(props: { children: JSX.Element }) {
 		let line = store.lines[lineId];
 		if (line === undefined) {
 			console.log(`${lineId} not found... fetch it from backend.`);
-			const data = await fetch(`${serverUrl()}/line/${lineId}`, {
+
+			const response = await fetch(`${serverUrl()}/line/${lineId}`, {
 				headers: { 'Content-Type': 'application/json' }
 			});
-			line = await data.json();
-			setStore('lines', lineId, line);
+
+			const json = await response.json();
+
+			if (response.ok) {
+				setStore('lines', lineId, json);
+				line = json;
+			}
+			else {
+				console.warn(`No line found for ${lineId} line id (${json}).`);
+			}
+
+
 		}
 		return line;
 	}
@@ -91,12 +102,19 @@ export function BusinessDataProvider(props: { children: JSX.Element }) {
 	}
 
 	const refreshPassages = async (stopId: number): Promise<void> => {
-		const httpOptions = { headers: { "Content-Type": "application/json" } };
 		console.log(`Fetching data for ${stopId}`);
-		const data = await fetch(`${serverUrl()}/stop/${stopId}/nextPassages`, httpOptions);
-		const response = await data.json();
-		_cleanupPassages(response.passages);
-		addPassages(response.passages);
+		const httpOptions = { headers: { "Content-Type": "application/json" } };
+		const response = await fetch(`${serverUrl()}/stop/${stopId}/nextPassages`, httpOptions);
+
+		const json = await response.json();
+
+		if (response.ok) {
+			_cleanupPassages(json.passages);
+			addPassages(json.passages);
+		}
+		else {
+			console.warn(`No passage found for ${stopId} stop (${json}).`);
+		}
 	}
 
 	const addPassages = (passages: Passages): void => {
@@ -155,39 +173,58 @@ ${linePassagesDestination.length} here... refresh all them.`);
 	}
 
 	const searchStopByName = async (name: string): Promise<Stops> => {
-		const data = await fetch(`${serverUrl()}/stop/?name=${name}`, {
+		const byIdStops: Stops = {};
+
+		const response = await fetch(`${serverUrl()}/stop/?name=${name}`, {
 			headers: { 'Content-Type': 'application/json' }
 		});
-		const stops = await data.json();
 
-		const byIdStops: Stops = {};
-		for (const stop of stops) {
-			byIdStops[stop.id] = stop;
-			setStore('stops', stop.id, stop);
-			for (const innerStop of stop.stops) {
-				setStore('stops', innerStop.id, innerStop);
+		const json = await response.json();
+
+		if (response.ok) {
+			for (const stop of json) {
+				byIdStops[stop.id] = stop;
+				setStore('stops', stop.id, stop);
+
+				if (stop.stops !== undefined) {
+					for (const innerStop of stop.stops) {
+						setStore('stops', innerStop.id, innerStop);
+					}
+				}
 			}
 		}
+		else {
+			console.warn(`No stop found for '${name}' (${json}).`);
+		}
+
 		return byIdStops;
 	}
 
-	const getStopDestinations = async (stopId: number): Promise<StopDestinations> => {
-		const data = await fetch(`${serverUrl()}/stop/${stopId}/destinations`, {
+	const getStopDestinations = async (stopId: number): Promise<StopDestinations | undefined> => {
+		const response = await fetch(`${serverUrl()}/stop/${stopId}/destinations`, {
 			headers: { 'Content-Type': 'application/json' }
 		});
-		const response = await data.json();
-		return response;
+		const destinations = response.ok ? await response.json() : undefined;
+		return destinations;
 	}
 
 	const getStopShape = async (stopId: number): Promise<StopShape | undefined> => {
 		let shape = store.stopShapes[stopId];
 		if (shape === undefined) {
 			console.log(`No shape found for ${stopId} stop... fetch it from backend.`);
-			const data = await fetch(`${serverUrl()}/stop/${stopId}/shape`, {
+			const response = await fetch(`${serverUrl()}/stop/${stopId}/shape`, {
 				headers: { 'Content-Type': 'application/json' }
 			});
-			shape = await data.json();
-			setStore('stopShapes', stopId, shape);
+
+			const json = await response.json();
+
+			if (response.ok) {
+				setStore('stopShapes', stopId, json);
+				shape = json;
+			}
+			else {
+				console.warn(`No shape found for ${stopId} stop (${json}).`);
+			}
 		}
 		return shape;
 	}