diff --git a/src/background/actions.ts b/src/background/actions.ts
index 946cfd8..c539ee6 100644
--- a/src/background/actions.ts
+++ b/src/background/actions.ts
@@ -1,6 +1,6 @@
 import { Actions, Request } from "../common";
 import { sendMessage } from "./messaging";
-import { logger } from "./common";
+import { logger } from "./logger";
 
 /**
  * redirect tab to url.
diff --git a/src/background/caches.ts b/src/background/caches.ts
index 1ee79a1..c51f2ea 100644
--- a/src/background/caches.ts
+++ b/src/background/caches.ts
@@ -1,4 +1,4 @@
-import { logger } from "./common";
+import { logger } from "./logger";
 import { Actions } from "../common";
 import { messageSubscribers } from "./messaging";
 
@@ -26,4 +26,6 @@ export class Caches {
             }
         }, 30000);
     }
-}
\ No newline at end of file
+}
+
+export const caches = new Caches();
diff --git a/src/background/common.ts b/src/background/common.ts
deleted file mode 100644
index 9b6960f..0000000
--- a/src/background/common.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-import { Logger, LOGGER_LEVEL } from "./logger";
-import { Caches } from "./caches";
-
-export const caches = new Caches();
-export const logger = new Logger(LOGGER_LEVEL.DEBUG, LOGGER_LEVEL.DISABLED);
-export const URL_REG = /^\s*(https?):\/\//im;
diff --git a/src/background/extractor.ts b/src/background/extractor.ts
index 59f2391..56a5a81 100644
--- a/src/background/extractor.ts
+++ b/src/background/extractor.ts
@@ -1,8 +1,9 @@
 import { Task } from "./task";
 import { saveFile } from "./tools";
 import { createTab, getActiveTab, ping } from "./actions";
-import { logger, caches } from "./common";
 import { ExtractResult } from "./result";
+import { logger } from "./logger";
+import { caches } from "./caches";
 
 export class Extractor {
     private _tasks: Task[] = [];
diff --git a/src/background/logger.ts b/src/background/logger.ts
index beceee0..4f2ff68 100644
--- a/src/background/logger.ts
+++ b/src/background/logger.ts
@@ -71,3 +71,5 @@ export class Logger {
         );
     }
 }
+
+export const logger = new Logger(LOGGER_LEVEL.DEBUG, LOGGER_LEVEL.DISABLED);
diff --git a/src/background/messaging.ts b/src/background/messaging.ts
index dbcb79c..d01de8d 100644
--- a/src/background/messaging.ts
+++ b/src/background/messaging.ts
@@ -1,6 +1,6 @@
 import { Request, Actions } from "../common";
 import { getTabByID } from "./actions";
-import { logger } from "./common";
+import { logger } from "./logger";
 
 /**
  *  Sending a message to target tab repeatedly until the response is not undefined.
@@ -49,7 +49,13 @@ export function sendMessage<T>(
                 let result: T = r;
 
                 if (dataChecker) {
-                    let pms = dataChecker(r, err, count);
+                    let pms: T | Promise<T>;
+                    try {
+                        pms = dataChecker(r, err, count);
+                    } catch (error) {
+                        reject(error);
+                        return;
+                    }
                     // don't catch if it's not a Promise
                     if (pms instanceof Promise) {
                         let checkerError: any;
diff --git a/src/background/task.ts b/src/background/task.ts
index 3b8b99d..9954b1e 100644
--- a/src/background/task.ts
+++ b/src/background/task.ts
@@ -4,7 +4,7 @@ import { testArgs, signitures } from "./signiture";
 import { ExtractResult } from "./result";
 import { messageSubscribers, ActionSubscriber } from "./messaging";
 import { Actions } from "../common";
-import { logger } from "./common";
+import { logger } from "./logger";
 
 export class Task {
     private _data: { [key: string]: string[][] } = {};
diff --git a/src/background/tools.ts b/src/background/tools.ts
index 18bfc07..d293c68 100644
--- a/src/background/tools.ts
+++ b/src/background/tools.ts
@@ -1,6 +1,7 @@
-import { URL_REG } from "./common";
 import { ExtractResult } from "./result";
 
+const URL_REG = /^\s*(https?):\/\//im;
+
 export function parseUrls(...args) {
     if (!args.length) return [];
     let arg = args.shift();