diff --git a/client/src/App.js b/client/src/App.js
index 4c7692d..18da5ab 100644
--- a/client/src/App.js
+++ b/client/src/App.js
@@ -29,7 +29,7 @@ function useCardsArr(defaultValue) {
   const [value, setValue] = React.useState(defaultValue)
 
   function trySetValue(cardsArr) {
-    if (checkCardsArr(cardsArr)) setValue(cardsArr)
+    if (checkCardsArr(cardsArr)||cardsArr===null) setValue(cardsArr)
     else console.error('Массив cardsArr не прошел проверку \n', cardsArr)
   }
 
@@ -48,7 +48,7 @@ function useUpdater() {
 }
 
 function App() {
-  const [cardsArr, setCards] = useCardsArr([])
+  const [cardsArr, setCards] = useCardsArr(null)
   const [editCardId, setEditCardId] = React.useState(null)
   const [loading, setLoading] = React.useState({ state: false, res: false })
 
@@ -59,8 +59,9 @@ function App() {
   const [updaterVal] = useUpdater()
 
   React.useEffect(loadDataFromServer, [logged, userName, updaterVal]) // eslint-disable-line react-hooks/exhaustive-deps
-  useDebouncedEffect(loadDataToServer, [cardsArr], 1000) // eslint-disable-line react-hooks/exhaustive-deps
-  React.useEffect(clearOldData, [logged]) // eslint-disable-line react-hooks/exhaustive-deps
+  useDebouncedEffect(loadDataToServer, [cardsArr], 300) // eslint-disable-line react-hooks/exhaustive-deps
+  //React.useEffect(loadDataToServer, [cardsArr]) // eslint-disable-line react-hooks/exhaustive-deps
+  React.useEffect(clearOldData, [logged, userName]) // eslint-disable-line react-hooks/exhaustive-deps
 
   ///////////
   function onLogin(login) {
@@ -106,17 +107,22 @@ function App() {
 
   function clearOldData() {
     //console.log("clearOldData, logged:", logged)
-    if (!logged && !!cardsArr) deleteAll()
+    if (!logged) setCards(null)
   }
   ///////////
 
   ///////////
   function loadDataToServer() {
     try {
+      let startUsername = userName
       if (logged && userName) postData(cardsArr)
         .then(res => {
           if (!cardsArr) console.log("empty post!")
           console.log('[onPostData]', res)
+          if (startUsername !== userName) {
+            console.log("упс, несостыковочка с userName");
+            loadDataToServer()
+          }
         })
         .catch(e => console.log(`Data post request error. Response: ${e}`))
     }
@@ -127,12 +133,14 @@ function App() {
 
   function loadDataFromServer() {
     try {
+      let startUsername = userName
       if (logged && userName) {
         setLoading({ state: true, res: loading.res })
         loadData()
           .then(data => {
             console.log('[onLoadData]', 'Данные с сервера загружены')
-            setLoadedCards(data)
+            if (startUsername === userName) setLoadedCards(data)
+            else console.log("упс, несостыковочка с userName");
             setLoading({ state: false, res: true })
           })
           .catch(e => {
@@ -225,7 +233,7 @@ function App() {
           <AddCard onCreate={addCard} onDeleteAll={deleteAll} />
           <ModalCardEdit card={getCardByIndex(editCardId)} index={editCardId} />
 
-          {cardsArr.length ? (
+          {cardsArr && cardsArr.length ? (
             <CardList cards={cardsArr} />
           ) : (loading.state || !loading.res) ? null : logged ? (
             <div className="container text-center">
diff --git a/client/src/Services/DataService.js b/client/src/Services/DataService.js
index 07450bb..d202228 100644
--- a/client/src/Services/DataService.js
+++ b/client/src/Services/DataService.js
@@ -42,8 +42,8 @@ export default function DataService() {
                     data: data,
                 },
             })
-                .done(data => res(data))
-                .fail(data => rej(data))
+                .done(resdata => res(resdata))
+                .fail(rejdata => rej(rejdata))
             /*.always(() => console.log(
                 `requested - newUser:"${user}" resolveData:"${data}" \n
                  request ${rc} - "${target}" ended \n `
@@ -74,6 +74,7 @@ export default function DataService() {
     function checkData(data) {
         //console.log('start check data')
         try {
+            if( data === null) console.log("null data");
             return data === null || data === [] || checkCardsArr(data)
         } catch {
             return false
@@ -92,13 +93,15 @@ export default function DataService() {
                     .then((d) => {
                         let data = tryParce(d)//here we parce json
                         //console.log("[DATA] from loadData(): ", data)
+                        if(!data)console.log("empty data from server");
                         if (!checkData(data)) {
                             console.error("[loadData] Bad data format")
                             console.log(data)
-                            if (user !== null) {
+                            let checkDel = user !== null
+                            if (checkDel && window.confirm("Bad data: " + data + ". Delete data on server?")) {
                                 console.log('clear data')
                                 requestPostData([new Card({ id: 0, color: "orange", name: "Error", text: "Данные были очищены из за ошибки" })]).then(() => loadData().then(res, rej), rej)//очистка данных
-                            } else rej("Not format data & unlogged")
+                            } else rej("Not format data" + !user ? " & unlogged" : "")
                         } else {
                             res(data || [])
                         }
@@ -118,7 +121,10 @@ export default function DataService() {
                     ? Promise.reject(rej())
                     : loadData())
                     .then((d) => {
+                        if(!data)console.log("empty data to post");
+                        if(!d)console.log("empty loaded to check");
                         let pDat = data === null ? (d || []) : data
+                        if(!pDat)console.log("empty will be posted");
                         requestPostData(pDat).then(res, rej)
                     })
                     .catch(rej)