improve error handling

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);
         })
     })