GFACServiceJobSubmitter ArithmeticException: / by zero

Following error is coming sometime while launching the experiment. This is coming when we are trying to pick ZK children for gfac service. It looks like gfacServer is empty.

[INFO] Validation of org.apache.airavata.orchestrator.core.validator.impl.ExperimentStatusValidator is SUCCESSFUL
[]
org.apache.airavata.orchestrator.core.exception.OrchestratorException: Error launching the job
at org.apache.airavata.orchestrator.cpi.impl.SimpleOrchestratorImpl.launchExperiment(SimpleOrchestratorImpl.java:81)
at org.apache.airavata.orchestrator.server.OrchestratorServerHandler.launchTask(OrchestratorServerHandler.java:442)
at org.apache.airavata.orchestrator.cpi.OrchestratorService$Processor$launchTask.getResult(OrchestratorService.java:525)
at org.apache.airavata.orchestrator.cpi.OrchestratorService$Processor$launchTask.getResult(OrchestratorService.java:510)
at org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
at org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:225)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ArithmeticException: / by zero
at org.apache.airavata.orchestrator.core.impl.GFACServiceJobSubmitter.submit(GFACServiceJobSubmitter.java:89)
at org.apache.airavata.orchestrator.cpi.impl.SimpleOrchestratorImpl.launchExperiment(SimpleOrchestratorImpl.java:79)
... 9 more