diff --git a/scripts/extract.js b/scripts/extract.js
index 46b568f..a3843f9 100644
--- a/scripts/extract.js
+++ b/scripts/extract.js
@@ -153,7 +153,8 @@ function sendMessage(tab, req, cond, interval) {
             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.");
+                reject("Task interupted due to the target tab is closed.");
+                return;
             }
 
             chrome.tabs.sendMessage(tab.id, req, r => {
@@ -183,6 +184,7 @@ async function getActiveTab(currentWindow) {
 async function getTabByID(id) {
     return new Promise((resolve, reject) => {
         chrome.tabs.get(id, function (tab) {
+            chrome.runtime.lastError;
             resolve(tab);
         })
     })
diff --git a/scripts/extractor.js b/scripts/extractor.js
index 4cbfb13..e4007a7 100644
--- a/scripts/extractor.js
+++ b/scripts/extractor.js
@@ -47,7 +47,7 @@ class Extractor {
                 this._results[this._tasks[this._tasks.length - 1]] = result;
                 this.save();
             }
-        );
+        ).catch(err => console.log(err));
     }
     /**
      * restart from specified task, but don't restart the previous tasks.
@@ -76,7 +76,7 @@ class Extractor {
                 this._results[this._tasks[this._tasks.length - 1]] = result;
                 this.save();
             }
-        );
+        ).catch(err => console.log(err));
     }
     /**
      * Save result of a task