java.lang.NullPointerException: null

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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.cloud.consul.discovery.ConsulCatalogWatch.catalogServicesWatch(ConsulCatalogWatch.java:74)

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