diff --git a/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByIdHandler.java b/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByIdHandler.java
index 55e726e455..35ea9a6714 100644
--- a/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByIdHandler.java
+++ b/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByIdHandler.java
@@ -30,7 +30,7 @@
 
 import java.io.IOException;
 import java.io.OutputStream;
-
+import java.util.Objects;
 
 import com.sun.net.httpserver.HttpExchange;
 
@@ -60,7 +60,7 @@ public void handle(HttpExchange httpExchange) throws IOException {
 
         try (OutputStream out = httpExchange.getResponseBody()) {
             WebHookConfig result = operation.queryWebHookConfigById(webHookConfig); // operating result
-            out.write(JsonUtils.toJSONString(result).getBytes(Constants.DEFAULT_CHARSET));
+            out.write(Objects.requireNonNull(JsonUtils.toJSONString(result)).getBytes(Constants.DEFAULT_CHARSET));
         } catch (Exception e) {
             log.error("get WebHookConfigOperation implementation Failed.", e);
         }
diff --git a/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByManufacturerHandler.java b/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByManufacturerHandler.java
index f49e7942d3..3a16cce36c 100644
--- a/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByManufacturerHandler.java
+++ b/eventmesh-runtime/src/main/java/org/apache/eventmesh/runtime/admin/handler/QueryWebHookConfigByManufacturerHandler.java
@@ -73,7 +73,7 @@ public void handle(HttpExchange httpExchange) throws IOException {
 
         try (OutputStream out = httpExchange.getResponseBody()) {
             List<WebHookConfig> result = operation.queryWebHookConfigByManufacturer(webHookConfig, pageNum, pageSize); // operating result
-            out.write(JsonUtils.toJSONString(result).getBytes(Constants.DEFAULT_CHARSET));
+            out.write(Objects.requireNonNull(JsonUtils.toJSONString(result)).getBytes(Constants.DEFAULT_CHARSET));
         } catch (Exception e) {
             log.error("get WebHookConfigOperation implementation Failed.", e);
         }