NullPointerException when putting into Cache

16:06:31,680 ERROR [org.infinispan.interceptors.InvocationContextInterceptor] (http-localhost.localdomain-127.0.0.1-8080-4) ISPN000136: Execution error: java.lang.NullPointerException
	at org.infinispan.commands.write.PutKeyValueCommand.perform(PutKeyValueCommand.java:82) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.CallInterceptor.handleDefault(CallInterceptor.java:83) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:61) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.DistributionInterceptor.handleWriteCommand(DistributionInterceptor.java:464) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.DistributionInterceptor.visitPutKeyValueCommand(DistributionInterceptor.java:274) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.EntryWrappingInterceptor.invokeNextAndApplyChanges(EntryWrappingInterceptor.java:199) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.EntryWrappingInterceptor.visitPutKeyValueCommand(EntryWrappingInterceptor.java:134) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.locking.NonTransactionalLockingInterceptor.visitPutKeyValueCommand(NonTransactionalLockingInterceptor.java:68) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.base.CommandInterceptor.handleDefault(CommandInterceptor.java:130) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:61) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.StateTransferLockInterceptor.handleWithRetries(StateTransferLockInterceptor.java:201) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.StateTransferLockInterceptor.visitPutKeyValueCommand(StateTransferLockInterceptor.java:131) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.base.CommandInterceptor.invokeNextInterceptor(CommandInterceptor.java:116) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.InvocationContextInterceptor.handleAll(InvocationContextInterceptor.java:116) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.InvocationContextInterceptor.handleDefault(InvocationContextInterceptor.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.AbstractVisitor.visitPutKeyValueCommand(AbstractVisitor.java:61) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.commands.write.PutKeyValueCommand.acceptVisitor(PutKeyValueCommand.java:76) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.interceptors.InterceptorChain.invoke(InterceptorChain.java:345) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.CacheImpl.executeCommandAndCommitIfNeeded(CacheImpl.java:941) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.CacheImpl.put(CacheImpl.java:654) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.CacheImpl.put(CacheImpl.java:646) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]
	at org.infinispan.CacheSupport.put(CacheSupport.java:52) [infinispan-core-5.1.0.CR4.jar:5.1.0.CR4]