diff --git a/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/DispatcherHandlerHandleMethodInterceptor.java b/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/DispatcherHandlerHandleMethodInterceptor.java
index 5330e22a6..712ca6569 100644
--- a/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/DispatcherHandlerHandleMethodInterceptor.java
+++ b/apm-sniffer/apm-sdk-plugin/spring-plugins/webflux-5.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/webflux/v5/DispatcherHandlerHandleMethodInterceptor.java
@@ -82,13 +82,25 @@ public class DispatcherHandlerHandleMethodInterceptor implements InstanceMethods
     public static EnhancedInstance getInstance(Object o) {
         EnhancedInstance instance = null;
         if (o instanceof ServerWebExchangeDecorator) {
-            ServerWebExchange delegate = ((ServerWebExchangeDecorator) o).getDelegate();
-            if (delegate instanceof DefaultServerWebExchange) {
-                instance = (EnhancedInstance) delegate;
-            }
+            instance = getEnhancedInstance((ServerWebExchangeDecorator) o);
         } else if (o instanceof DefaultServerWebExchange) {
             instance = (EnhancedInstance) o;
         }
         return instance;
     }
+
+
+    private static EnhancedInstance getEnhancedInstance(ServerWebExchangeDecorator serverWebExchangeDecorator) {
+        Object o = serverWebExchangeDecorator.getDelegate();
+        if (o instanceof ServerWebExchangeDecorator) {
+            return getEnhancedInstance((ServerWebExchangeDecorator) o);
+        } else if (o instanceof DefaultServerWebExchange) {
+            return (EnhancedInstance) o;
+        } else if (o == null) {
+            throw new NullPointerException("The expected class DefaultServerWebExchange is null");
+        } else {
+            throw new RuntimeException("Unknown parameter types:" + o.getClass());
+        }
+    }
+
 }
diff --git a/apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.1.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/cloud/gateway/v21x/NettyRoutingFilterInterceptor.java b/apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.1.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/cloud/gateway/v21x/NettyRoutingFilterInterceptor.java
index c37aab8e4..251198568 100644
--- a/apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.1.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/cloud/gateway/v21x/NettyRoutingFilterInterceptor.java
+++ b/apm-sniffer/optional-plugins/optional-spring-plugins/optional-spring-cloud/gateway-2.1.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/spring/cloud/gateway/v21x/NettyRoutingFilterInterceptor.java
@@ -79,13 +79,24 @@ public class NettyRoutingFilterInterceptor implements InstanceMethodsAroundInter
     public static EnhancedInstance getInstance(Object o) {
         EnhancedInstance instance = null;
         if (o instanceof ServerWebExchangeDecorator) {
-            ServerWebExchange delegate = ((ServerWebExchangeDecorator) o).getDelegate();
-            if (delegate instanceof DefaultServerWebExchange) {
-                instance = (EnhancedInstance) delegate;
-            }
+            instance = getEnhancedInstance((ServerWebExchangeDecorator) o);
         } else if (o instanceof DefaultServerWebExchange) {
             instance = (EnhancedInstance) o;
         }
         return instance;
     }
+
+
+    private static EnhancedInstance getEnhancedInstance(ServerWebExchangeDecorator serverWebExchangeDecorator) {
+        Object o = serverWebExchangeDecorator.getDelegate();
+        if (o instanceof ServerWebExchangeDecorator) {
+            return getEnhancedInstance((ServerWebExchangeDecorator) o);
+        } else if (o instanceof DefaultServerWebExchange) {
+            return (EnhancedInstance) o;
+        } else if (o == null) {
+            throw new NullPointerException("The expected class DefaultServerWebExchange is null");
+        } else {
+            throw new RuntimeException("Unknown parameter types:" + o.getClass());
+        }
+    }
 }