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java.lang.NullPointerException: null	at org.springframework.cloud.client.discovery.event.HeartbeatMonitor.update(HeartbeatMonitor.java:37)	at org.springframework.cloud.netflix.zuul.ZuulProxyConfiguration$ZuulDiscoveryRefreshListener.resetIfNeeded(ZuulProxyConfiguration.java:184)	at org.springframework.cloud.netflix.zuul.ZuulProxyConfiguration$ZuulDiscoveryRefreshListener.onApplicationEvent(ZuulProxyConfiguration.java:178)	at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:166)	at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:381)	at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:335)	at org.springframework.cloud.consul.discovery.ConsulCatalogWatch.catalogServicesWatch(ConsulCatalogWatch.java:74)