diff --git a/module/extension/control.php b/module/extension/control.php
index af9f8f01c8..4ca71c2bda 100644
--- a/module/extension/control.php
+++ b/module/extension/control.php
@@ -456,6 +456,7 @@ class extension extends control
 
         if($_FILES)
         {
+            if($_FILES['file']['size'] == 0) die(js::alert(str_replace("'", "\'", sprintf($this->lang->extension->errorFileNotEmpty, $fileName, $return->error))));
             $tmpName   = $_FILES['file']['tmp_name'];
             $fileName  = $_FILES['file']['name'];
             move_uploaded_file($tmpName, $this->app->getTmpRoot() . "/extension/$fileName");
diff --git a/module/extension/lang/de.php b/module/extension/lang/de.php
index 441209015c..a30e94b6fc 100644
--- a/module/extension/lang/de.php
+++ b/module/extension/lang/de.php
@@ -121,3 +121,4 @@ $lang->extension->errorDepends                 = 'Benötigte Erweiterung wurde n
 $lang->extension->errorIncompatible            = 'Inkompatibel mit dieser Version von ZenTao.';
 $lang->extension->errorUninstallDepends        = '“%s” benötigt für diese Erweiterung. Bitte nicht installieren.';
 $lang->extension->errorExtracted               = 'The package file %s extracted failed. The error is:<br />%s';
+$lang->extension->errorFileNotEmpty            = 'Please upload the file.';
diff --git a/module/extension/lang/en.php b/module/extension/lang/en.php
index f317c8c536..9f6d32a4da 100644
--- a/module/extension/lang/en.php
+++ b/module/extension/lang/en.php
@@ -121,3 +121,4 @@ $lang->extension->errorDepends                 = 'Dependent extension has not be
 $lang->extension->errorIncompatible            = 'Incompatible with your ZenTao.';
 $lang->extension->errorUninstallDepends        = '“%s” is dependent on this extension. Please do not uninstall it.';
 $lang->extension->errorExtracted               = 'The package file %s extracted failed. The error is:<br />%s';
+$lang->extension->errorFileNotEmpty            = 'Please upload the file.';
diff --git a/module/extension/lang/fr.php b/module/extension/lang/fr.php
index 4ab32b1f5e..37f976d5ff 100644
--- a/module/extension/lang/fr.php
+++ b/module/extension/lang/fr.php
@@ -121,3 +121,4 @@ $lang->extension->errorDepends                 = "L'extension dépendante n'a pa
 $lang->extension->errorIncompatible            = 'Incompatible avec votre version de ZenTao.';
 $lang->extension->errorUninstallDepends        = '“%s” est nécessaire pour cette extension. Veuillez ne pas installer.';
 $lang->extension->errorExtracted               = 'The package file %s extracted failed. The error is:<br />%s';
+$lang->extension->errorFileNotEmpty            = 'Please upload the file.';
diff --git a/module/extension/lang/vi.php b/module/extension/lang/vi.php
index f93637a70b..ad5aa839b3 100644
--- a/module/extension/lang/vi.php
+++ b/module/extension/lang/vi.php
@@ -121,3 +121,4 @@ $lang->extension->errorDepends                 = 'Dependent extension has not be
 $lang->extension->errorIncompatible            = 'Incompatible with your ZenTao.';
 $lang->extension->errorUninstallDepends        = '“%s” is dependent on this extension. Vui lòng do not uninstall it.';
 $lang->extension->errorExtracted               = 'The package file %s extracted failed. The error is:<br />%s';
+$lang->extension->errorFileNotEmpty            = 'Please upload the file.';
diff --git a/module/extension/lang/zh-cn.php b/module/extension/lang/zh-cn.php
index 5f30b85c27..b79c5e998b 100644
--- a/module/extension/lang/zh-cn.php
+++ b/module/extension/lang/zh-cn.php
@@ -121,3 +121,4 @@ $lang->extension->errorDepends                 = '以下依赖插件没有安装
 $lang->extension->errorIncompatible            = '该插件与您的禅道版本不兼容';
 $lang->extension->errorUninstallDepends        = '插件“%s”依赖该插件，不能卸载';
 $lang->extension->errorExtracted               = '包文件 %s 解压缩失败，可能不是一个有效的zip文件。错误信息如下：<br />%s';
+$lang->extension->errorFileNotEmpty            = '上传文件不能为空';
diff --git a/module/extension/lang/zh-tw.php b/module/extension/lang/zh-tw.php
index 67ef957ee1..5ae1efb7d3 100644
--- a/module/extension/lang/zh-tw.php
+++ b/module/extension/lang/zh-tw.php
@@ -121,3 +121,4 @@ $lang->extension->errorDepends                 = '以下依賴插件沒有安裝
 $lang->extension->errorIncompatible            = '該插件與您的禪道版本不兼容';
 $lang->extension->errorUninstallDepends        = '插件“%s”依賴該插件，不能卸載';
 $lang->extension->errorExtracted               = '包檔案 %s 解壓縮失敗，可能不是一個有效的zip檔案。錯誤信息如下：<br />%s';
+$lang->extension->errorFileNotEmpty            = '上傳文件不能為空';