diff --git a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DecodeableRpcResult.java b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DecodeableRpcResult.java
index 30ee3a0e3e1..100c6e53cd3 100644
--- a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DecodeableRpcResult.java
+++ b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DecodeableRpcResult.java
@@ -118,11 +118,13 @@ public Object decode(Channel channel, InputStream input) throws IOException {
     public void decode() throws Exception {
         if (!hasDecoded && channel != null && inputStream != null) {
             try {
-                if (ConfigurationUtils.getSystemConfiguration().getBoolean(SERIALIZATION_SECURITY_CHECK_KEY, false)) {
-                    Object serializationType_obj = invocation.get(SERIALIZATION_ID_KEY);
-                    if (serializationType_obj != null) {
-                        if ((byte) serializationType_obj != serializationType) {
-                            throw new IOException("Unexpected serialization id:" + serializationType + " received from network, please check if the peer send the right id.");
+                if (invocation != null) {
+                    if (ConfigurationUtils.getSystemConfiguration().getBoolean(SERIALIZATION_SECURITY_CHECK_KEY, false)) {
+                        Object serializationTypeObj = invocation.get(SERIALIZATION_ID_KEY);
+                        if (serializationTypeObj != null) {
+                            if ((byte) serializationTypeObj != serializationType) {
+                                throw new IOException("Unexpected serialization id:" + serializationType + " received from network, please check if the peer send the right id.");
+                            }
                         }
                     }
                 }
diff --git a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodecSupport.java b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodecSupport.java
index 2dbb312b431..500888fa853 100644
--- a/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodecSupport.java
+++ b/dubbo-rpc/dubbo-rpc-dubbo/src/main/java/org/apache/dubbo/rpc/protocol/dubbo/DubboCodecSupport.java
@@ -30,21 +30,21 @@
 public class DubboCodecSupport {
 
     public static Serialization getRequestSerialization(URL url, Invocation invocation) {
-        Object serializationType_obj = invocation.get(SERIALIZATION_ID_KEY);
-        if (serializationType_obj != null) {
-            return CodecSupport.getSerializationById((byte) serializationType_obj);
+        Object serializationTypeObj = invocation.get(SERIALIZATION_ID_KEY);
+        if (serializationTypeObj != null) {
+            return CodecSupport.getSerializationById((byte) serializationTypeObj);
         }
         return ExtensionLoader.getExtensionLoader(Serialization.class).getExtension(
                 url.getParameter(org.apache.dubbo.remoting.Constants.SERIALIZATION_KEY, Constants.DEFAULT_REMOTING_SERIALIZATION));
     }
 
     public static Serialization getResponseSerialization(URL url, AppResponse appResponse) {
-        Object invocation_obj = appResponse.getAttribute(INVOCATION_KEY);
-        if (invocation_obj != null) {
-            Invocation invocation = (Invocation) invocation_obj;
-            Object serializationType_obj = invocation.get(SERIALIZATION_ID_KEY);
-            if (serializationType_obj != null) {
-                return CodecSupport.getSerializationById((byte) serializationType_obj);
+        Object invocationObj = appResponse.getAttribute(INVOCATION_KEY);
+        if (invocationObj != null) {
+            Invocation invocation = (Invocation) invocationObj;
+            Object serializationTypeObj = invocation.get(SERIALIZATION_ID_KEY);
+            if (serializationTypeObj != null) {
+                return CodecSupport.getSerializationById((byte) serializationTypeObj);
             }
         }
         return ExtensionLoader.getExtensionLoader(Serialization.class).getExtension(