diff --git a/scripts/extract.js b/scripts/extract.js
index bfe2900..46b568f 100644
--- a/scripts/extract.js
+++ b/scripts/extract.js
@@ -28,7 +28,7 @@ async function getData(itemsSelector, fieldSelectors, ...args) {
         if (arg instanceof Array) {
             urls = arg;
         } else if (arg instanceof ExractResult) {
-            urls = arg.squash().filter(v=>!!v);
+            urls = arg.squash().filter(v => !!v);
         } else {
             let urlTempl = arg;
             if (urlTempl) {
@@ -103,7 +103,7 @@ function extractTabData(tab, itemsSelector, fieldSelectors) {
         itemsSelector: itemsSelector,
         fieldSelectors: fieldSelectors
     }
-    let cond = r => !!r;
+    let cond = r => r && r.length;
     return sendMessage(tab, req, cond);
 }
 
@@ -139,31 +139,30 @@ function queryUrl(tab, urlExcluded) {
  * @param {object} tab the table where to send the message
  * @param {object} req the request data.
  * @param {function} cond success condition function, r:any=>boolean
- * @param {number} failedTimeOut fail time out
- * @param {number} detectInterval interval for detecting
+ * @param {number} interval interval for detecting
  * @return {Promise} a promise of the response.
  */
-function sendMessage(tab, req, cond, failedTimeOut, detectInterval) {
+function sendMessage(tab, req, cond, interval) {
     req.from = "DataExtracter:" + req.from;
-    failedTimeOut = failedTimeOut || 10000;
-    detectInterval = detectInterval || 500;
+    interval = interval || 500;
     return new Promise((resolve, reject) => {
-        let timeOut;
-        let rejectTimeout = setTimeout(() => {
-            reject(`${req.from} failed after ${failedTimeOut/1000} seconds.`);
-            clearTimeout(timeOut);
-        }, failedTimeOut);
+
         loop();
 
-        function loop() {
+        async function loop() {
+            console.log("request for", req.from);
+            let tabAvailable = await getTabByID(tab.id);
+            if (!tabAvailable) {
+                throw new Error("Task interupted due to the target tab is closed.");
+            }
+
             chrome.tabs.sendMessage(tab.id, req, r => {
                 if (!cond || cond(r)) {
-                    clearTimeout(rejectTimeout);
                     resolve(r);
                 } else {
-                    timeOut = setTimeout(() => {
+                    setTimeout(() => {
                         loop();
-                    }, detectInterval);
+                    }, interval);
                 }
             });
         }
@@ -179,4 +178,12 @@ async function getActiveTab(currentWindow) {
             resolve(tabs[0]);
         })
     })
+}
+
+async function getTabByID(id) {
+    return new Promise((resolve, reject) => {
+        chrome.tabs.get(id, function (tab) {
+            resolve(tab);
+        })
+    })
 }
\ No newline at end of file