diff --git a/pom.xml b/pom.xml
index 3e0b319..a896bfa 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>cn.cloudowr</groupId>
     <artifactId>sdk</artifactId>
-    <version>1.3.4</version>
+    <version>1.3.6</version>
     <build>
         <plugins>
             <plugin>
diff --git a/src/main/java/cn/cloudowr/sdk/jfinal/AbsController.java b/src/main/java/cn/cloudowr/sdk/jfinal/AbsController.java
index 31733b2..9702896 100644
--- a/src/main/java/cn/cloudowr/sdk/jfinal/AbsController.java
+++ b/src/main/java/cn/cloudowr/sdk/jfinal/AbsController.java
@@ -160,6 +160,7 @@ public abstract class AbsController extends cn.cloudowr.sdk.jfinal.Controller im
         Document $set = document.get("$set", Document.class);
         if ($set != null) {
             $set.forEach((key, value) -> {
+                if ("_id".equals(key)) return;
                 updateOps.add(Updates.set(key, value));
             });
         }
diff --git a/src/main/java/cn/cloudowr/sdk/jfinal/JSONInterceptor.java b/src/main/java/cn/cloudowr/sdk/jfinal/JSONInterceptor.java
new file mode 100644
index 0000000..3028310
--- /dev/null
+++ b/src/main/java/cn/cloudowr/sdk/jfinal/JSONInterceptor.java
@@ -0,0 +1,20 @@
+package cn.cloudowr.sdk.jfinal;
+
+import com.jfinal.aop.Interceptor;
+import com.jfinal.aop.Invocation;
+
+/**
+ * Created by lyf66 on 2017/2/16.
+ */
+public class JSONInterceptor implements Interceptor {
+
+    @Override
+    public void intercept(Invocation inv) {
+        String json = inv.getController().getPara("json");
+        if (json != null && !json.isEmpty()) {
+            inv.invoke();
+        } else {
+            inv.getController().render(new ErrorRender(400, "json must not be null"));
+        }
+    }
+}