add instanceof

spring-cloud-starter-tencent-polaris-circuitbreaker/src/main/java/com/tencent/cloud/polaris/circuitbreaker/PolarisRestTemplateRegisterAutoConfiguration.java

@@ -53,10 +53,13 @@ public class PolarisRestTemplateRegisterAutoConfiguration implements Application
 	}
 
 	private void initRestTemplate(String beanName, Object bean) {
+		if (bean instanceof RestTemplate) {
 			RestTemplate restTemplate = (RestTemplate) bean;
 			restTemplate.setErrorHandler(polarisRestTemplateResponseErrorHandler);
 		}
 		
+	}
+
 	@Override
 	public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
 		this.applicationContext = applicationContext;