diff --git a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/GenericFilter.java b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/GenericFilter.java
index 831c7a5f72cf..b97c379053a6 100644
--- a/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/GenericFilter.java
+++ b/dubbo-rpc/dubbo-rpc-api/src/main/java/org/apache/dubbo/rpc/filter/GenericFilter.java
@@ -65,8 +65,11 @@
  */
 @Activate(group = CommonConstants.PROVIDER, order = -20000)
 public class GenericFilter implements Filter, Filter.Listener {
+
     private static final Logger logger = LoggerFactory.getLogger(GenericFilter.class);
 
+    private static final Gson gson = new Gson();
+
     @Override
     public Result invoke(Invoker<?> invoker, Invocation inv) throws RpcException {
         if ((inv.getMethodName().equals($INVOKE) || inv.getMethodName().equals($INVOKE_ASYNC))
@@ -190,8 +193,10 @@ public Result invoke(Invoker<?> invoker, Invocation inv) throws RpcException {
     }
 
     private Object[] getGsonGenericArgs(final Object[] args, Type[] types) {
-        Gson gson = new Gson();
         return IntStream.range(0, args.length).mapToObj(i -> {
+            if (!(args[i] instanceof String)) {
+                throw new RpcException(String.format("Generic serialization [%s] Json syntax exception thrown when parsing (%s)", GENERIC_SERIALIZATION_GSON, "parameter type must be String"));
+            }
             String str = args[i].toString();
             Type type = TypeToken.get(types[i]).getType();
             try {