elasticsearch_max_time_per_index configuratoin leads to ArithmeticException division by zero

[ghost]

I'm using the latest graylog2 v0.93-3 version with elasticinbox 1.4.x . i've added the following parameter in the graylog2.conf :

elasticsearch_max_time_per_index = 30d

to keep the index 30d persisted. After restarting the graylog2-server service, I'm seeing the following message in the server.log

2014-12-29T13:59:22.157+01:00 ERROR [IndexRotationThread] Couldn't point deflector to a new index
com.google.inject.ProvisionException: Guice provision errors:

1) Error injecting constructor, java.lang.ArithmeticException: / by zero
  at org.graylog2.indexer.rotation.TimeBasedRotationStrategy.<init>(TimeBasedRotationStrategy.java:43)
  at org.graylog2.indexer.rotation.TimeBasedRotationStrategy.class(TimeBasedRotationStrategy.java:34)
  while locating org.graylog2.indexer.rotation.TimeBasedRotationStrategy
  while locating org.graylog2.plugin.indexer.rotation.RotationStrategy annotated with @com.google.inject.multibindings.Element(setName=,uniqueId=112)
  at org.graylog2.bindings.RotationStrategyBindings.configure(RotationStrategyBindings.java:29)
  while locating java.util.Map<java.lang.String, org.graylog2.plugin.indexer.rotation.RotationStrategy>
    for parameter 0 at org.graylog2.bindings.providers.RotationStrategyProvider.<init>(RotationStrategyProvider.java:32)
  while locating org.graylog2.bindings.providers.RotationStrategyProvider
  while locating org.graylog2.plugin.indexer.rotation.RotationStrategy

1 error
        at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:987)
        at org.graylog2.periodical.IndexRotationThread.checkForRotation(IndexRotationThread.java:79)
        at org.graylog2.periodical.IndexRotationThread.doRun(IndexRotationThread.java:66)
        at org.graylog2.plugin.periodical.Periodical.run(Periodical.java:83)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ArithmeticException: / by zero
        at org.graylog2.indexer.rotation.TimeBasedRotationStrategy.determineRotationPeriodAnchor(TimeBasedRotationStrategy.java:100)
        at org.graylog2.indexer.rotation.TimeBasedRotationStrategy.<init>(TimeBasedRotationStrategy.java:48)
        at org.graylog2.indexer.rotation.TimeBasedRotationStrategy.<init>(TimeBasedRotationStrategy.java:43)
        at org.graylog2.indexer.rotation.TimeBasedRotationStrategy$$FastClassByGuice$$de058489.newInstance(<generated>)
        at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40)
        at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60)
        at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85)
        at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254)
        at com.google.inject.internal.ProviderToInternalFactoryAdapter$1.call(ProviderToInternalFactoryAdapter.java:46)
        at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031)
        at com.google.inject.internal.ProviderToInternalFactoryAdapter.get(ProviderToInternalFactoryAdapter.java:40)
        at com.google.inject.Scopes$1$1.get(Scopes.java:65)
at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40)
        at com.google.inject.internal.FactoryProxy.get(FactoryProxy.java:54)
        at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978)
        at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1031)
        at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974)
        at com.google.inject.spi.ProviderLookup$1.get(ProviderLookup.java:89)
        at com.google.inject.multibindings.MapBinder$RealMapBinder$2.get(MapBinder.java:387)
        at com.google.inject.multibindings.MapBinder$RealMapBinder$2.get(MapBinder.java:383)
        at com.google.inject.internal.InternalFactoryToProviderAdapter.get(InternalFactoryToProviderAdapter.java:40)
        at com.google.inject.internal.SingleParameterInjector.inject(SingleParameterInjector.java:38)
        at com.google.inject.internal.SingleParameterInjector.getAll(SingleParameterInjector.java:62)
        at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:84)
        at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254)
        at com.google.inject.internal.BoundProviderFactory.get(BoundProviderFactory.java:53)
        at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978)
        at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024)
        at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974)
        ... 10 more

changing the parameter to 31d, 720h, 721h and even 24h results in the same error.

Configuring the parameter with 5h, like:

elasticsearch_max_time_per_index = 5h

and restarting graylog2-server, it works well.

I'm running on an ubuntu 12.04 LTS