diff --git a/src/langs/zh_CN.txt b/src/langs/zh_CN.txt
index 6925c6e..7814947 100644
--- a/src/langs/zh_CN.txt
+++ b/src/langs/zh_CN.txt
@@ -186,6 +186,7 @@ Input value is invalid!=输入的内容无效!
 Protocol is invalid!=协议无效!
 RPC host cannot be empty!=RPC 主机不能为空!
 RPC secret is not base64 encoded!=RPC 密钥不是 Base64 编码后的字符串!
+URL is not base64 encoded!=指定 URL 不是 Base64 编码后的字符串!
 Tap to configure and get started with AriaNg.=您还没有进行过设置, 点击这里进行设置.
 
 [error]
diff --git a/src/scripts/config/defaultLanguage.js b/src/scripts/config/defaultLanguage.js
index 88c0ca0..9d9bf7e 100644
--- a/src/scripts/config/defaultLanguage.js
+++ b/src/scripts/config/defaultLanguage.js
@@ -190,6 +190,7 @@
             'Protocol is invalid!': 'Protocol is invalid!',
             'RPC host cannot be empty!': 'RPC host cannot be empty!',
             'RPC secret is not base64 encoded!': 'RPC secret is not base64 encoded!',
+            'URL is not base64 encoded!': 'URL is not base64 encoded!',
             'Tap to configure and get started with AriaNg.': 'Tap to configure and get started with AriaNg.',
             'error': {
                 'unknown': 'Unknown error occurred.',
diff --git a/src/scripts/controllers/command.js b/src/scripts/controllers/command.js
index 889b886..fcf214c 100644
--- a/src/scripts/controllers/command.js
+++ b/src/scripts/controllers/command.js
@@ -19,7 +19,15 @@
 
         if (path.indexOf('/new/') === 0) {
             var base64Url = $routeParams.url;
-            var url = base64.urldecode(base64Url);
+            var url = base64Url;
+
+            try {
+                url = base64.urldecode(base64Url);
+            } catch (ex) {
+                ariaNgCommonService.showError('URL is not base64 encoded!');
+                return;
+            }
+
             $rootScope.loadPromise = newUrlDownload(url);
             ariaNgLogService.info('[CommandController] new download: ' + url);
         } else if (path.indexOf('/settings/rpc/set/') === 0) {