diff --git a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
index 32b4aa9..3dc9294 100644
--- a/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
+++ b/src/main/scala/gitbucket/core/controller/SystemSettingsController.scala
@@ -192,7 +192,9 @@
 
   post("/admin/plugins/:pluginId/_uninstall")(adminOnly {
     val pluginId = params("pluginId")
-    PluginRegistry().getPlugins().find(_.pluginId == pluginId).foreach { plugin =>
+    PluginRegistry().getPlugins()
+      .collect { case (plugin, true) if plugin.pluginId == pluginId => plugin }
+      .foreach { plugin =>
       PluginRegistry.uninstall(pluginId, request.getServletContext, loadSystemSettings(), request2Session(request).conn)
       flash += "info" -> s"${pluginId} was uninstalled."
     }
diff --git a/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala b/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
index 7e5b0fd..7a84d70 100644
--- a/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
+++ b/src/main/scala/gitbucket/core/plugin/PluginRegistory.scala
@@ -27,7 +27,7 @@
 
 class PluginRegistry {
 
-  private val plugins = new ListBuffer[PluginInfo]
+  private val plugins = new ListBuffer[(PluginInfo, Boolean)]
   private val javaScripts = new ListBuffer[(String, String)]
   private val controllers = new ListBuffer[(ControllerBase, String)]
   private val images = mutable.Map[String, String]()
@@ -53,9 +53,9 @@
   private val suggestionProviders = new ListBuffer[SuggestionProvider]
   suggestionProviders += new UserNameSuggestionProvider()
 
-  def addPlugin(pluginInfo: PluginInfo): Unit = plugins += pluginInfo
+  def addPlugin(pluginInfo: PluginInfo, enabled: Boolean): Unit = plugins += ((pluginInfo, enabled))
 
-  def getPlugins(): List[PluginInfo] = plugins.toList
+  def getPlugins(): List[(PluginInfo, Boolean)] = plugins.toList
 
   def addImage(id: String, bytes: Array[Byte]): Unit = {
     val encoded = Base64.getEncoder.encodeToString(bytes)
@@ -181,7 +181,9 @@
    * Uninstall a specified plugin.
    */
   def uninstall(pluginId: String, context: ServletContext, settings: SystemSettings, conn: java.sql.Connection): Unit = synchronized {
-    instance.getPlugins().find(_.pluginId == pluginId).foreach { plugin =>
+    instance.getPlugins()
+      .collect { case (plugin, true) if plugin.pluginId == plugin => plugin }
+      .foreach { plugin =>
 //      try {
 //        plugin.pluginClass.uninstall(instance, context, settings)
 //      } catch {
@@ -243,10 +245,10 @@
           val plugin = classLoader.loadClass("Plugin").getDeclaredConstructor().newInstance().asInstanceOf[Plugin]
           val pluginId = plugin.pluginId
 
-          // Check duplication
-          instance.getPlugins().find(_.pluginId == pluginId).foreach { x =>
-            throw new IllegalStateException(s"Plugin ${pluginId} is duplicated. ${x.pluginJar.getName} is available.")
-          }
+//          // Check duplication
+//          instance.getPlugins().find(_.pluginId == pluginId).foreach { x =>
+//            throw new IllegalStateException(s"Plugin ${pluginId} is duplicated. ${x.pluginJar.getName} is available.")
+//          }
 
           // Migration
           val solidbase = new Solidbase()
@@ -269,7 +271,7 @@
             pluginClass   = plugin,
             pluginJar     = pluginJar,
             classLoader   = classLoader
-          ))
+          ), true)
         } catch {
           case e: Throwable => {
             logger.error(s"Error during plugin initialization: ${pluginJar.getName}", e)
@@ -285,7 +287,9 @@
   }
 
   def shutdown(context: ServletContext, settings: SystemSettings): Unit = synchronized {
-    instance.getPlugins().foreach { plugin =>
+    instance.getPlugins()
+      .collect { case (plugin, true) => plugin }
+      .foreach { plugin =>
       try {
         plugin.pluginClass.shutdown(instance, context, settings)
       } catch {
diff --git a/src/main/twirl/gitbucket/core/admin/plugins.scala.html b/src/main/twirl/gitbucket/core/admin/plugins.scala.html
index 4603d2b..e7e6084 100644
--- a/src/main/twirl/gitbucket/core/admin/plugins.scala.html
+++ b/src/main/twirl/gitbucket/core/admin/plugins.scala.html
@@ -1,4 +1,4 @@
-@(plugins: List[gitbucket.core.plugin.PluginInfo], info: Option[Any])(implicit context: gitbucket.core.controller.Context)
+@(plugins: List[(gitbucket.core.plugin.PluginInfo, Boolean)], info: Option[Any])(implicit context: gitbucket.core.controller.Context)
 @gitbucket.core.html.main("Plugins"){
   @gitbucket.core.admin.html.menu("plugins") {
     @gitbucket.core.helper.html.information(info)
@@ -8,12 +8,12 @@
     <h1>Installed plugins</h1>
     @if(plugins.size > 0) {
       <ul>
-      @plugins.map { plugin =>
+      @plugins.map { case (plugin, enabled) =>
         <li><a href="#@plugin.pluginId">@plugin.pluginId:@plugin.pluginVersion</a></li>
       }
       </ul>
 
-      @plugins.map { plugin =>
+      @plugins.map { case (plugin, enabled) =>
         <div class="panel panel-default">
           <div class="panel-heading strong" id="@plugin.pluginId">
             <form action="@{context.path}/admin/plugins/@{plugin.pluginId}/_uninstall" method="POST" class="pull-right uninstall-form">