diff --git a/Aria/src/main/java/com/arialyy/aria/orm/AbsDelegate.java b/Aria/src/main/java/com/arialyy/aria/orm/AbsDelegate.java
index 0fc7e88c..eafac17d 100644
--- a/Aria/src/main/java/com/arialyy/aria/orm/AbsDelegate.java
+++ b/Aria/src/main/java/com/arialyy/aria/orm/AbsDelegate.java
@@ -18,7 +18,6 @@ package com.arialyy.aria.orm;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.support.v4.util.LruCache;
-import android.text.TextUtils;
 import com.arialyy.aria.util.ALog;
 import com.arialyy.aria.util.CommonUtil;
 import java.lang.reflect.Field;
@@ -134,11 +133,13 @@ abstract class AbsDelegate {
   }
 
   void closeCursor(Cursor cursor) {
-    if (cursor != null && !cursor.isClosed()) {
-      try {
-        cursor.close();
-      } catch (android.database.SQLException e) {
-        e.printStackTrace();
+    synchronized (AbsDelegate.class) {
+      if (cursor != null && !cursor.isClosed()) {
+        try {
+          cursor.close();
+        } catch (android.database.SQLException e) {
+          e.printStackTrace();
+        }
       }
     }
   }
diff --git a/Aria/src/main/java/com/arialyy/aria/orm/DelegateFind.java b/Aria/src/main/java/com/arialyy/aria/orm/DelegateFind.java
index 81c8a85d..e292a67f 100644
--- a/Aria/src/main/java/com/arialyy/aria/orm/DelegateFind.java
+++ b/Aria/src/main/java/com/arialyy/aria/orm/DelegateFind.java
@@ -201,7 +201,7 @@ class DelegateFind extends AbsDelegate {
    * @param pColumnAlias 关联查询父表别名
    * @param cColumnAlias 关联查询子表别名
    */
-  private <T extends AbsWrapper, P extends DbEntity, C extends DbEntity> List<T> newInstanceEntity(
+  private synchronized <T extends AbsWrapper, P extends DbEntity, C extends DbEntity> List<T> newInstanceEntity(
       Class<T> clazz, Class<P> parent,
       Class<C> child,
       Cursor cursor,
@@ -373,7 +373,7 @@ class DelegateFind extends AbsDelegate {
   /**
    * 根据数据游标创建一个具体的对象
    */
-  private <T extends DbEntity> List<T> newInstanceEntity(Class<T> clazz, Cursor cursor) {
+  private synchronized <T extends DbEntity> List<T> newInstanceEntity(Class<T> clazz, Cursor cursor) {
     List<Field> fields = CommonUtil.getAllFields(clazz);
     List<T> entitys = new ArrayList<>();
     if (fields != null && fields.size() > 0) {
@@ -419,6 +419,10 @@ class DelegateFind extends AbsDelegate {
    */
   private void setFieldValue(Class type, Field field, int column, Cursor cursor, Object entity)
       throws IllegalAccessException {
+    if (cursor == null || cursor.isClosed()) {
+      ALog.e(TAG, "cursor没有初始化");
+      return;
+    }
     if (type == String.class) {
       String temp = cursor.getString(column);
       if (!TextUtils.isEmpty(temp)) {
diff --git a/Aria/src/main/java/com/arialyy/aria/util/SSLContextUtil.java b/Aria/src/main/java/com/arialyy/aria/util/SSLContextUtil.java
index 0e5f7b48..b6a9427d 100644
--- a/Aria/src/main/java/com/arialyy/aria/util/SSLContextUtil.java
+++ b/Aria/src/main/java/com/arialyy/aria/util/SSLContextUtil.java
@@ -58,6 +58,9 @@ public class SSLContextUtil {
    */
   public static SSLContext getSSLContextFromAssets(String caAlias, String caPath,
       @ProtocolType String protocol) {
+    if (TextUtils.isEmpty(caAlias) || TextUtils.isEmpty(caPath)){
+      return null;
+    }
     try {
       String cacheKey = getCacheKey(caAlias, caPath);
       SSLContext sslContext = SSL_CACHE.get(cacheKey);
diff --git a/DEV_LOG.md b/DEV_LOG.md
index a4c11901..1760c145 100644
--- a/DEV_LOG.md
+++ b/DEV_LOG.md
@@ -1,4 +1,6 @@
 ## 开发日志
+  + v_3.4.9
+    - fix bug https://github.com/AriaLyy/Aria/issues/276
   + v_3.4.8
     - 组合任务新增`updateUrls(List<String>)`用于修改组合子任务的url，[see](https://aria.laoyuyu.me/aria_doc/api/update_url.html)
     - 出于安全考虑，FTP数据库去掉密码的保存
diff --git a/README.md b/README.md
index e4e13d78..0c57ecc4 100644
--- a/README.md
+++ b/README.md
@@ -32,8 +32,8 @@ Aria有以下特点：
 [![Download](https://api.bintray.com/packages/arialyy/maven/AriaApi/images/download.svg)](https://bintray.com/arialyy/maven/AriaApi/_latestVersion)
 [![Download](https://api.bintray.com/packages/arialyy/maven/AriaCompiler/images/download.svg)](https://bintray.com/arialyy/maven/AriaCompiler/_latestVersion)
 ```java
-compile 'com.arialyy.aria:aria-core:3.4.8'
-annotationProcessor 'com.arialyy.aria:aria-compiler:3.4.8'
+compile 'com.arialyy.aria:aria-core:3.4.9'
+annotationProcessor 'com.arialyy.aria:aria-compiler:3.4.9'
 ```
 如果出现android support，请将 `compile 'com.arialyy.aria:aria-core:<last-version>'`替换为
 ```
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index c29c9966..87d31608 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -15,11 +15,11 @@
       android:theme="@style/AppTheme.NoActionBar">
         <!--android:name=".MainActivity"-->
     <!--android:name=".download.group.DownloadGroupActivity"-->
-    <!--android:name=".test.AnyRunActivity"-->
     <!--android:name=".test.TestFTPDirActivity"-->
         <!--android:name=".download.SingleTaskActivity"-->
+    <!--android:name=".test.TestFTPActivity"-->
     <activity
-    android:name=".test.TestFTPActivity"
+    android:name=".test.AnyRunActivity"
         android:label="@string/app_name">
       <intent-filter>
         <action android:name="android.intent.action.MAIN"/>
diff --git a/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java b/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java
index 4dcc4cb8..4a903a86 100644
--- a/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java
+++ b/app/src/main/java/com/arialyy/simple/test/AnyRunActivity.java
@@ -21,12 +21,12 @@ public class AnyRunActivity extends BaseActivity<ActivityTestBinding> {
   AnyRunnModule module;
   String[] urls;
   int index = 0;
-  String URL = "http://static.gaoshouyou.com/d/12/0d/7f120f50c80d2e7b8c4ba24ece4f9cdd.apk";
+  //String URL = "http://static.gaoshouyou.com/d/12/0d/7f120f50c80d2e7b8c4ba24ece4f9cdd.apk";
   //String URL = "http://58.213.157.242:8081/sims_file/rest/v1/file/mshd_touchscreen_ms/guideFile/41c33556-dc4a-4d78-bb76-b9f627f94448.mp4/%E5%85%AB%E5%8D%A6%E6%B4%B2%E5%8D%97%E4%BA%AC%E5%86%9C%E4%B8%9A%E5%98%89%E5%B9%B4%E5%8D%8E0511.mp4";
   //String URL = "http://d1.showself.com/download/showself_android-s236279_release.apk";
   //String URL = "http://static.gaoshouyou.com/d/22/94/822260b849944492caadd2983f9bb624.apk";
   //private final String URL = "ftp://192.168.29.140:21/download/AriaPrj.rar";
-  //String URL = "https://dl.genymotion.com/releases/genymotion-2.12.1/genymotion-2.12.1-vbox.exe";
+  String URL = "https://dl.genymotion.com/releases/genymotion-2.12.1/genymotion-2.12.1-vbox.exe";
   //String URL = "ftp://192.168.29.140:21/download/SDK_Demo-release.apk";
   //String URL = "ftps://192.168.29.140:990/download/SDK_Demo-release.apk";
   //String URL = "http://d.quanscreen.com/k/down/resourceDownLoad?resourceId=1994&clientId=A000011106034058176";
diff --git a/build.gradle b/build.gradle
index 5f5e6e62..f7206410 100644
--- a/build.gradle
+++ b/build.gradle
@@ -39,7 +39,7 @@ task clean(type: Delete) {
 ext {
   userOrg = 'arialyy'
   groupId = 'com.arialyy.aria'
-  publishVersion = '3.4.8'
+  publishVersion = '3.4.9'
 //  publishVersion = '1.0.3'  //FTP插件
   repoName='maven'
   desc = 'android 下载框架'