diff --git a/chrome-extension-server-log/manifest.json b/chrome-extension-server-log/manifest.json
index 08be879..4211d5c 100644
--- a/chrome-extension-server-log/manifest.json
+++ b/chrome-extension-server-log/manifest.json
@@ -1,7 +1,7 @@
 {
   "name": "ServerLog",
   "description": "__MSG_description__",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "background": {
     "page": "background.html"
   },
diff --git a/package.json b/package.json
index c5df9f8..6218fa5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "serverlog-node",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "description": "Simple, practical and creative logging library, with a Chrome extension support.",
   "main": "src/index.js",
   "scripts": {
diff --git a/src/logger.js b/src/logger.js
index 51e308f..0218693 100644
--- a/src/logger.js
+++ b/src/logger.js
@@ -151,7 +151,7 @@ Logger.prototype = {
                 const keysStr = req.headers[reqHeaderName];
                 if (keysStr && keysStr.split(';').some(t => t.trim() === this.options.extension.key)) {
                     try {
-                        const currentHeader = res.getHeader[resHeaderName];
+                        const currentHeader = res.getHeader(resHeaderName);
 
                         // Convert array to string
                         let msgStr = '';
@@ -205,6 +205,8 @@ Logger.prototype = {
                             } else {
                                 res.setHeader(resHeaderName, msgToSet);
                             }
+                        } else {
+                            console.log('ServerLog warn: headers has sent!');
                         }
                     } catch (e) {
                         console.error(e);