Error: Multiple entries with same key

[fetis]

Hi, I installed Sonar 5.6.3 and compiled the fresh version of the plugin from sonar-5.x tag. Scanner task runs well but I background tasks failed with message

016.11.30 17:02:30 INFO  [o.s.s.c.s.ComputationStepExecutor] Compute Quality profile measures | time=1ms
2016.11.30 17:02:30 ERROR [o.s.s.c.t.CeWorkerCallableImpl] Failed to execute task AVi1-RB6hyMTobEbqTRi
java.lang.IllegalArgumentException: Multiple entries with same key: js=JavaScript and js=JS
	at com.google.common.collect.ImmutableMap.checkNoConflict(ImmutableMap.java:150) ~[guava-17.0.jar:na]
	at com.google.common.collect.RegularImmutableMap.checkNoConflictInBucket(RegularImmutableMap.java:104) ~[guava-17.0.jar:na]
	at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:70) ~[guava-17.0.jar:na]
	at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:254) ~[guava-17.0.jar:na]
	at com.google.common.collect.Maps.uniqueIndex(Maps.java:1166) ~[guava-17.0.jar:na]
	at com.google.common.collect.Maps.uniqueIndex(Maps.java:1140) ~[guava-17.0.jar:na]
	at org.sonar.server.computation.language.LanguageRepositoryImpl.<init>(LanguageRepositoryImpl.java:46) ~[sonar-server-5.6.3.jar:na]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_112]
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_112]
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_112]
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_112]
	at org.picocontainer.injectors.AbstractInjector.newInstance(AbstractInjector.java:145) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.ConstructorInjector$1.run(ConstructorInjector.java:342) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.AbstractInjector$ThreadLocalCyclicDependencyGuard.observe(AbstractInjector.java:270) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.ConstructorInjector.getComponentInstance(ConstructorInjector.java:364) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.AbstractInjectionFactory$LifecycleAdapter.getComponentInstance(AbstractInjectionFactory.java:56) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.behaviors.AbstractBehavior.getComponentInstance(AbstractBehavior.java:64) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.behaviors.Stored.getComponentInstance(Stored.java:91) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:699) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.DefaultPicoContainer.getComponent(DefaultPicoContainer.java:647) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.DefaultPicoContainer.getComponent(DefaultPicoContainer.java:632) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.parameters.BasicComponentParameter$1.resolveInstance(BasicComponentParameter.java:118) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.parameters.ComponentParameter$1.resolveInstance(ComponentParameter.java:136) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.SingleMemberInjector.getParameter(SingleMemberInjector.java:78) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.ConstructorInjector$CtorAndAdapters.getParameterArguments(ConstructorInjector.java:309) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.ConstructorInjector$1.run(ConstructorInjector.java:335) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.AbstractInjector$ThreadLocalCyclicDependencyGuard.observe(AbstractInjector.java:270) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.ConstructorInjector.getComponentInstance(ConstructorInjector.java:364) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.injectors.AbstractInjectionFactory$LifecycleAdapter.getComponentInstance(AbstractInjectionFactory.java:56) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.behaviors.AbstractBehavior.getComponentInstance(AbstractBehavior.java:64) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.behaviors.Stored.getComponentInstance(Stored.java:91) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.DefaultPicoContainer.getInstance(DefaultPicoContainer.java:699) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.DefaultPicoContainer.getComponent(DefaultPicoContainer.java:647) ~[picocontainer-2.15.jar:na]
	at org.picocontainer.DefaultPicoContainer.getComponent(DefaultPicoContainer.java:678) ~[picocontainer-2.15.jar:na]
	at org.sonar.core.platform.ComponentContainer.getComponentByType(ComponentContainer.java:272) ~[sonar-core-5.6.3.jar:na]
	at org.sonar.server.computation.step.AbstractComputationSteps$1.apply(AbstractComputationSteps.java:43) ~[sonar-server-5.6.3.jar:na]
	at org.sonar.server.computation.step.AbstractComputationSteps$1.apply(AbstractComputationSteps.java:40) ~[sonar-server-5.6.3.jar:na]
	at com.google.common.collect.Iterators$8.transform(Iterators.java:794) ~[guava-17.0.jar:na]
	at com.google.common.collect.TransformedIterator.next(TransformedIterator.java:48) ~[guava-17.0.jar:na]
	at org.sonar.server.computation.step.ComputationStepExecutor.executeSteps(ComputationStepExecutor.java:62) ~[sonar-server-5.6.3.jar:na]
	at org.sonar.server.computation.step.ComputationStepExecutor.execute(ComputationStepExecutor.java:52) ~[sonar-server-5.6.3.jar:na]
	at org.sonar.server.computation.taskprocessor.report.ReportTaskProcessor.process(ReportTaskProcessor.java:75) ~[sonar-server-5.6.3.jar:na]
	at org.sonar.server.computation.taskprocessor.CeWorkerCallableImpl.executeTask(CeWorkerCallableImpl.java:81) [sonar-server-5.6.3.jar:na]
	at org.sonar.server.computation.taskprocessor.CeWorkerCallableImpl.call(CeWorkerCallableImpl.java:56) [sonar-server-5.6.3.jar:na]
	at org.sonar.server.computation.taskprocessor.CeWorkerCallableImpl.call(CeWorkerCallableImpl.java:35) [sonar-server-5.6.3.jar:na]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_112]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_112]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_112]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_112]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_112]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_112]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_112]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_112]

my sonar-project files is next

# Required metadata
sonar.projectKey=xxx
sonar.projectName=xxx
sonar.projectVersion=1.0.0

# Comma-separated paths to directories with sources (required)
sonar.sources=dashboard/dist/app

# exclude some folders (typically dependencies)
sonar.exclusions=**/*.min.js,**/*.spec.js

# sonar.language=js

# Encoding of the source files
sonar.sourceEncoding=UTF-8

# Code coverage reoprt
sonar.javascript.lcov.reportPath=dashboard/test-reports/lcov/lcov.info

# Unit test results
sonar.sii.test.ut.js.report.path=dashboard/test-reports/junit/results.xml

I thought that 5.x version is supported by this plugin.