diff --git a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/discovery/NacosServiceDiscovery.java b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/discovery/NacosServiceDiscovery.java
index ffe73aaf1..848abde9c 100644
--- a/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/discovery/NacosServiceDiscovery.java
+++ b/spring-cloud-alibaba-starters/spring-cloud-starter-alibaba-nacos-discovery/src/main/java/com/alibaba/cloud/nacos/discovery/NacosServiceDiscovery.java
@@ -92,7 +92,9 @@ public class NacosServiceDiscovery {
 		metadata.put("nacos.weight", instance.getWeight() + "");
 		metadata.put("nacos.healthy", instance.isHealthy() + "");
 		metadata.put("nacos.cluster", instance.getClusterName() + "");
-		metadata.putAll(instance.getMetadata());
+		if (instance.getMetadata() != null) {
+			metadata.putAll(instance.getMetadata());
+		}
 		nacosServiceInstance.setMetadata(metadata);
 
 		if (metadata.containsKey("secure")) {