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java.lang.NullPointerException: null at org.springframework.cloud.client.discovery.event.HeartbeatMonitor.update(HeartbeatMonitor.java:37)[spring-cloud-commons-1.1.1.RELEASE.jar!/:1.1.1.RELEASE] at org.springframework.cloud.netflix.zuul.ZuulProxyConfiguration$ZuulDiscoveryRefreshListener.resetIfNeeded(ZuulProxyConfiguration.java:184)[spring-cloud-netflix-core-1.1.5.RELEASE.jar!/:1.1.5.RELEASE] at org.springframework.cloud.netflix.zuul.ZuulProxyConfiguration$ZuulDiscoveryRefreshListener.onApplicationEvent(ZuulProxyConfiguration.java:178)[spring-cloud-netflix-core-1.1.5.RELEASE.jar!/:1.1.5.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166)[spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)[spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:381)[spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:335)[spring-context-4.2.6.RELEASE.jar!/:4.2.6.RELEASE] at org.springframework.cloud.consul.discovery.ConsulCatalogWatch.catalogServicesWatch(ConsulCatalogWatch.java:74)[spring-cloud-consul-discovery-1.0.2.RELEASE.jar!/:1.0.2.RELEASE]