diff --git a/db/db.go b/db/db.go
index f90621f..343e1fd 100644
--- a/db/db.go
+++ b/db/db.go
@@ -323,7 +323,14 @@ func (c *client) GetAllDonloadClients() []*ent.DownloadClients {
 	cc, err := c.ent.DownloadClients.Query().Order(ent.Asc(downloadclients.FieldPriority1)).All(context.TODO())
 	if err != nil {
 		log.Errorf("no download client")
-		return nil
+		return []*ent.DownloadClients{
+			{
+				Implementation: downloadclients.ImplementationBuildin,
+				Name:           "内建下载器",
+				Priority1:      9999,
+				Enable:         true,
+			},
+		}
 	}
 	cc = append(cc, &ent.DownloadClients{
 		Implementation: downloadclients.ImplementationBuildin,
diff --git a/engine/client.go b/engine/client.go
index 77cf919..906dc5c 100644
--- a/engine/client.go
+++ b/engine/client.go
@@ -36,6 +36,7 @@ type Engine struct {
 	tasks      utils.Map[int, *Task]
 	language   string
 	schedulers utils.Map[string, scheduler]
+	buildin *buildin.Downloader
 }
 
 func (c *Engine) registerCronJob(name string, cron string, f func() error) {
@@ -143,8 +144,16 @@ func (c *Engine) reloadTasks() {
 }
 
 func (c *Engine) buildInDownloader() (pkg.Downloader, error) {
+	if c.buildin!= nil {
+		return c.buildin, nil	
+	}
 	dir := c.db.GetDownloadDir()
-	return buildin.NewDownloader(dir)
+	d, err := buildin.NewDownloader(dir)
+	if err != nil {
+		return nil, errors.Wrap(err, "buildin downloader")	
+	}
+	c.buildin = d
+	return d, nil
 }
 
 func (c *Engine) GetDownloadClient() (pkg.Downloader, *ent.DownloadClients, error) {
@@ -175,7 +184,7 @@ func (c *Engine) GetDownloadClient() (pkg.Downloader, *ent.DownloadClients, erro
 		} else if d.Implementation == downloadclients.ImplementationBuildin {
 			bin, err := c.buildInDownloader()
 			if err != nil {
-				log.Warnf("connect to download client error: %v", d.URL)
+				log.Warnf("connect to download client error: %v", err)
 				continue
 			}
 			return bin, d, nil
diff --git a/server/activity.go b/server/activity.go
index 4622930..655d1d5 100644
--- a/server/activity.go
+++ b/server/activity.go
@@ -106,7 +106,11 @@ func (s *Server) RemoveActivity(c *gin.Context) (interface{}, error) {
 	episodeIds := s.core.GetEpisodeIds(his)
 
 	for _, id := range episodeIds {
-		ep, _ := s.db.GetEpisode(his.MediaID, his.SeasonNum, id)
+		ep, err := s.db.GetEpisode(his.MediaID, his.SeasonNum, id)
+		if err != nil {
+			log.Warnf("get episode error: %v", err)
+			continue	
+		}
 		if !s.db.IsEpisodeDownloadingOrDownloaded(id) && ep.Status != episode.StatusDownloaded {
 			//没有正在下载中或者下载完成的任务，并且episode状态不是已经下载完成
 			s.db.SetEpisodeStatus(id, episode.StatusMissing)
diff --git a/ui/lib/activity.dart b/ui/lib/activity.dart
index fb6ec44..a3d5bbc 100644
--- a/ui/lib/activity.dart
+++ b/ui/lib/activity.dart
@@ -60,11 +60,14 @@ class _ActivityPageState extends ConsumerState<ActivityPage>
           AsyncValue<List<Activity>>? activitiesWatcher;
 
           if (selectedTab == 2) {
-            activitiesWatcher = ref.watch(activitiesDataProvider(ActivityStatus.archive));
+            activitiesWatcher =
+                ref.watch(activitiesDataProvider(ActivityStatus.archive));
           } else if (selectedTab == 1) {
-            activitiesWatcher = ref.watch(activitiesDataProvider(ActivityStatus.seeding));
+            activitiesWatcher =
+                ref.watch(activitiesDataProvider(ActivityStatus.seeding));
           } else if (selectedTab == 0) {
-            activitiesWatcher = ref.watch(activitiesDataProvider(ActivityStatus.active));
+            activitiesWatcher =
+                ref.watch(activitiesDataProvider(ActivityStatus.active));
           }
 
           return activitiesWatcher!.when(
@@ -143,7 +146,8 @@ class _ActivityPageState extends ConsumerState<ActivityPage>
                           trailing: selectedTab != 2
                               ? IconButton(
                                   tooltip: "删除任务",
-                                  onPressed: () => onDelete()(ac.id!),
+                                  onPressed: () =>
+                                      showConfirmDialog(context, ac.id!),
                                   icon: const Icon(Icons.delete))
                               : const Text("-"),
                         ),
@@ -160,12 +164,45 @@ class _ActivityPageState extends ConsumerState<ActivityPage>
     );
   }
 
-  Function(int) onDelete() {
-    return (id) {
-      final f = ref
-          .read(activitiesDataProvider(ActivityStatus.active).notifier)
-          .deleteActivity(id);
-      showLoadingWithFuture(f);
-    };
+  Future<void> showConfirmDialog(BuildContext oriContext, int id) {
+    var add2Blacklist = false;
+    return showDialog<void>(
+      context: context,
+      barrierDismissible: true,
+      builder: (BuildContext context) {
+        return AlertDialog(
+          title: const Text("确认删除"),
+          content: StatefulBuilder(builder: (context, setState) {
+            return CheckboxListTile(
+                value: add2Blacklist,
+                title: Text("加入黑名单"),
+                onChanged: (v) {
+                  setState(
+                    () {
+                      add2Blacklist = v!;
+                    },
+                  );
+                });
+          }),
+          actions: [
+            TextButton(
+                onPressed: () => Navigator.of(context).pop(),
+                child: const Text("取消")),
+            TextButton(
+                child: const Text("确认"),
+                onPressed: () {
+                  final f = ref
+                      .read(activitiesDataProvider(ActivityStatus.active)
+                          .notifier)
+                      .deleteActivity(id, add2Blacklist)
+                      .then((value) {
+                    Navigator.of(context).pop();
+                  });
+                  showLoadingWithFuture(f);
+                }),
+          ],
+        );
+      },
+    );
   }
 }
diff --git a/ui/lib/providers/activity.dart b/ui/lib/providers/activity.dart
index 74ff01c..cab2c59 100644
--- a/ui/lib/providers/activity.dart
+++ b/ui/lib/providers/activity.dart
@@ -68,11 +68,11 @@ class ActivityData
     return activities;
   }
 
-  Future<void> deleteActivity(int id) async {
+  Future<void> deleteActivity(int id, bool add2Blacklist) async {
     final dio = APIs.getDio();
     var resp = await dio.post(APIs.activityDeleteUrl, data: {
       "id": id,
-      "add_2_blacklist": false,
+      "add_2_blacklist": add2Blacklist,
     });
     final sp = ServerResponse.fromJson(resp.data);
     if (sp.code != 0) {