TLS Toolkit - NPE when used in client mode

java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.nifi.toolkit.tls.TlsToolkitMain.doMain(TlsToolkitMain.java:109)
        at org.apache.nifi.toolkit.tls.TlsToolkitMain.main(TlsToolkitMain.java:55)
Caused by: java.lang.NullPointerException
        at org.apache.nifi.toolkit.tls.configuration.InstanceDefinition.createDefinition(InstanceDefinition.java:75)
        at org.apache.nifi.toolkit.tls.configuration.InstanceDefinition.lambda$createDefinitions$0(InstanceDefinition.java:59)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
        at java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:419)
        at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:647)
        at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:272)
        at java.util.stream.Streams$StreamBuilderImpl.forEachRemaining(Streams.java:419)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
        at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:272)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
        at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
        at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:485)
        at java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:272)
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:482)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:472)
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:566)
        at org.apache.nifi.toolkit.tls.configuration.InstanceDefinition.createDefinitions(InstanceDefinition.java:60)
        at org.apache.nifi.toolkit.tls.service.client.TlsCertificateAuthorityClientCommandLine.doParse(TlsCertificateAuthorityClientCommandLine.java:123)
        at org.apache.nifi.toolkit.tls.commandLine.BaseCommandLine.parse(BaseCommandLine.java:109)
        at org.apache.nifi.toolkit.tls.service.client.TlsCertificateAuthorityClientCommandLine.main(TlsCertificateAuthorityClientCommandLine.java:71)
        ... 6 more
Service client error: null