Suppress data checking until previous call is done.

src/App.js

@@ -156,7 +156,10 @@ function App() {
 	useEffect(()=>{
 		var notificationLastUpdate = new Date(new Date()-(NOTIFICATIONTIMEOUT*1000))
 		var largestNotificationID = -1
+		var dataCheck=true
 		const interval = setInterval(()=>{
+			if (dataCheck) {
+				dataCheck=false
 				notificationLastUpdate = new Date(new Date()-(NOTIFICATIONTIMEOUT*1000))
 				axios.get(BACKEND_URL+"/getNotifications?date="+encodeURIComponent(LZ(4,notificationLastUpdate.getUTCFullYear())+"-"+LZ(2,notificationLastUpdate.getUTCMonth()+1)+"-"+LZ(2,notificationLastUpdate.getUTCDate())+" "+LZ(2,notificationLastUpdate.getUTCHours())+":"+LZ(2,notificationLastUpdate.getUTCMinutes())+":"+LZ(2,notificationLastUpdate.getUTCSeconds())+"."+LZ(3,notificationLastUpdate.getUTCMilliseconds())+"+00"))
 				.then((data)=>{
@@ -185,6 +188,10 @@ function App() {
 				.catch((err)=>{
 					console.log(err.message)
 				})
+				.then(()=>{
+					dataCheck=true
+				})
+			}
 		},1000)
 		return ()=>clearInterval(interval)
 	},[])