NPE in RM while using YarnClient.getApplications()

java.lang.NullPointerException: java.lang.NullPointerException
	at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptMetrics.getAggregateAppResourceUsage(RMAppAttemptMetrics.java:118)
	at org.apache.hadoop.yarn.server.resourcemanager.rmapp.attempt.RMAppAttemptImpl.getApplicationResourceUsageReport(RMAppAttemptImpl.java:857)
	at org.apache.hadoop.yarn.server.resourcemanager.rmapp.RMAppImpl.createAndGetApplicationReport(RMAppImpl.java:629)
	at org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.verifyAndCreateAppReport(ClientRMService.java:972)
	at org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.getApplications(ClientRMService.java:898)
	at org.apache.hadoop.yarn.server.resourcemanager.ClientRMService.getApplications(ClientRMService.java:734)
	at org.apache.hadoop.yarn.api.impl.pb.service.ApplicationClientProtocolPBServiceImpl.getApplications(ApplicationClientProtocolPBServiceImpl.java:239)
	at org.apache.hadoop.yarn.proto.ApplicationClientProtocol$ApplicationClientProtocolService$2.callBlockingMethod(ApplicationClientProtocol.java:441)
	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:973)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2202)
	at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2198)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1738)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2196)

	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at org.apache.hadoop.yarn.ipc.RPCUtil.instantiateException(RPCUtil.java:53)
	at org.apache.hadoop.yarn.ipc.RPCUtil.instantiateRuntimeException(RPCUtil.java:85)
	at org.apache.hadoop.yarn.ipc.RPCUtil.unwrapAndThrowException(RPCUtil.java:122)
	at org.apache.hadoop.yarn.api.impl.pb.client.ApplicationClientProtocolPBClientImpl.getApplications(ApplicationClientProtocolPBClientImpl.java:254)
	at sun.reflect.GeneratedMethodAccessor731.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:191)
	at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
	at com.sun.proxy.$Proxy161.getApplications(Unknown Source)
	at org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.getApplications(YarnClientImpl.java:479)
	at org.apache.hadoop.yarn.client.api.impl.YarnClientImpl.getApplications(YarnClientImpl.java:456)

RMAppAttempt currentAttempt = rmContext.getRMApps()
                   .get(attemptId.getApplicationId()).getCurrentAppAttempt();