Exception when exiting the controller (karaf edition)

The following exception is observed when exiting the controller:

Exception in thread "pool-28-thread-6" java.lang.IllegalStateException: Transaction factory was already closed
at com.google.common.base.Preconditions.checkState(Preconditions.java:149)
at org.opendaylight.controller.md.sal.dom.broker.impl.AbstractDOMForwardedTransactionFactory.close(AbstractDOMForwardedTransactionFactory.java:215)
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataBrokerTransactionChainImpl.close(DOMDataBrokerTransactionChainImpl.java:80)
at org.opendaylight.controller.md.sal.binding.impl.BindingTranslatedTransactionChain.close(BindingTranslatedTransactionChain.java:118)
at org.opendaylight.controller.md.inventory.manager.FlowCapableInventoryProvider.close(FlowCapableInventoryProvider.java:85)
at org.opendaylight.controller.md.inventory.manager.InventoryActivator.stopImpl(InventoryActivator.java:36)
at org.opendaylight.controller.sal.binding.api.AbstractBrokerAwareActivator.onBrokerRemoved(AbstractBrokerAwareActivator.java:126)
at org.opendaylight.controller.sal.binding.api.AbstractBrokerAwareActivator$1$2.run(AbstractBrokerAwareActivator.java:53)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)