diff --git a/app/src/main/java/us/shandian/giga/get/DownloadMission.java b/app/src/main/java/us/shandian/giga/get/DownloadMission.java
index c48e5ffbc..f02eaae28 100644
--- a/app/src/main/java/us/shandian/giga/get/DownloadMission.java
+++ b/app/src/main/java/us/shandian/giga/get/DownloadMission.java
@@ -5,6 +5,7 @@ import android.os.Looper;
 import android.util.Log;
 
 import java.io.File;
+import java.io.ObjectInputStream;
 import java.io.Serializable;
 import java.lang.ref.WeakReference;
 import java.util.ArrayList;
@@ -312,6 +313,13 @@ public class DownloadMission implements Serializable {
         }
     }
 
+    private void readObject(ObjectInputStream inputStream)
+    throws java.io.IOException, ClassNotFoundException
+    {
+        inputStream.defaultReadObject();
+        mListeners = new ArrayList<>();
+    }
+
     private void deleteThisFromFile() {
         new File(getMetaFilename()).delete();
     }