JPA hibernate.cache.region_prefix property fails JConsole to connect to JBoss

If a web app is deployed (standalone) with a persistence.xml containing:

<property name="hibernate.cache.region_prefix" value=""/>

Then it is not possible to connect to the MBean Server with JConsole using instructions here:

https://community.jboss.org/wiki/UsingJconsoleToConnectToJMXOnAS7

Following stack trace is written to JBoss log:

12:27:03,406 WARN [org.jboss.remotingjmx.protocol.v1.ServerProxy] (pool-5-thread-16) Unexpected internal error: java.lang.NullPointerException
at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:49)
at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:55)
at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:55)
at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:55)
at org.jboss.as.jmx.model.RootResourceIterator.doIterate(RootResourceIterator.java:55)
at org.jboss.as.jmx.model.RootResourceIterator.iterate(RootResourceIterator.java:39)
at org.jboss.as.jmx.model.ModelControllerMBeanHelper.queryNames(ModelControllerMBeanHelper.java:136)
at org.jboss.as.jmx.model.ModelControllerMBeanServerPlugin.queryNames(ModelControllerMBeanServerPlugin.java:124)
at org.jboss.as.jmx.PluggableMBeanServerImpl.queryNames(PluggableMBeanServerImpl.java:280)
at org.jboss.remotingjmx.protocol.v1.ServerProxy$QueryNamesHandler.handle(ServerProxy.java:1197)
at org.jboss.remotingjmx.protocol.v1.ServerProxy$MessageReciever$1.run(ServerProxy.java:215)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_18]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_18]
at java.lang.Thread.run(Thread.java:619) [rt.jar:1.6.0_18]

If property is removed from persistence.xml it is possible to connect using JConsole and browse the MBeans.