InstanceAlreadyExistsException in logs while starting embed-server after failure

[disconnected /] embed-server --std-out=echo --empty-config
10:12:35,251 INFO  [org.jboss.modules] (AeshProcess: 1) JBoss Modules version 1.4.4.Final
10:12:35,323 INFO  [org.jboss.msc] (AeshProcess: 1) JBoss MSC version 1.2.6.Final
10:12:35,384 INFO  [org.jboss.as] (MSC service thread 1-6) WFLYSRV0049: WildFly Core 2.0.0.CR7-SNAPSHOT (WildFly Core 2.0.0.CR7-SNAPSHOT) starting
10:12:35,454 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-5) MSC000001: Failed to start service jboss.as.server-controller: org.jboss.msc.service.StartException in service jboss.as.server-controller: Failed to start service
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1904)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: WFLYCTL0389: Could not create an empty configuration at file /home/pkremens/devel/wildfly-core/dist/target/wildfly-core-2.0.0.CR7-SNAPSHOT/standalone/configuration/standalone.xml as there is an existing non-empty configuration there
	at org.jboss.as.controller.persistence.ConfigurationFile.getBootFile(ConfigurationFile.java:242)
	at org.jboss.as.controller.persistence.BackupXmlConfigurationPersister.<init>(BackupXmlConfigurationPersister.java:70)
	at org.jboss.as.server.Bootstrap$Configuration$1.createConfigurationPersister(Bootstrap.java:192)
	at org.jboss.as.server.ServerService.start(ServerService.java:249)
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
	... 3 more

Cannot start embedded server: WFLYEMB0022: Cannot invoke 'start' on standalone server: WFLYSRV0141: Cannot start server: Operation failed: Failed to start service: WFLYCTL0389: Could not create an empty configuration at file /home/pkremens/devel/wildfly-core/dist/target/wildfly-core-2.0.0.CR7-SNAPSHOT/standalone/configuration/standalone.xml as there is an existing non-empty configuration there

[disconnected /] embed-server --std-out=echo
10:12:40,211 INFO  [org.jboss.modules] (AeshProcess: 2) JBoss Modules version 1.4.4.Final
10:12:40,217 ERROR [org.jboss.msc] (AeshProcess: 2) MSC000010: Failed to register MBean with MBeanServer: javax.management.InstanceAlreadyExistsException: jboss.msc:type=container,name=jboss-as
	at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
	at org.jboss.msc.service.ServiceContainerImpl.<init>(ServiceContainerImpl.java:372)
	at org.jboss.msc.service.ServiceContainer$Factory.create(ServiceContainer.java:258)
	at org.jboss.as.server.BootstrapImpl$ShutdownHook.register(BootstrapImpl.java:208)
	at org.jboss.as.server.BootstrapImpl$ShutdownHook.access$100(BootstrapImpl.java:198)
	at org.jboss.as.server.BootstrapImpl.<init>(BootstrapImpl.java:62)
	at org.jboss.as.server.Bootstrap$Factory.newInstance(Bootstrap.java:256)
	at org.wildfly.core.embedded.EmbeddedStandaloneServerFactory$StandaloneServerImpl.start(EmbeddedStandaloneServerFactory.java:275)
	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:497)
	at org.wildfly.core.embedded.EmbeddedServerReference.invokeOnServer(EmbeddedServerReference.java:85)
	at org.wildfly.core.embedded.EmbeddedServerReference.start(EmbeddedServerReference.java:56)
	at org.jboss.as.cli.embedded.EmbedServerHandler.doHandle(EmbedServerHandler.java:205)
	at org.jboss.as.cli.handlers.CommandHandlerWithHelp.handle(CommandHandlerWithHelp.java:88)
	at org.jboss.as.cli.impl.CommandContextImpl.handle(CommandContextImpl.java:773)
	at org.jboss.as.cli.impl.CommandContextImpl.handleSafe(CommandContextImpl.java:796)
	at org.jboss.as.cli.impl.CommandContextImpl$2.execute(CommandContextImpl.java:410)
	at org.jboss.aesh.console.AeshProcess.run(AeshProcess.java:53)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

10:12:40,227 INFO  [org.jboss.as] (MSC service thread 2-8) WFLYSRV0049: WildFly Core 2.0.0.CR7-SNAPSHOT (WildFly Core 2.0.0.CR7-SNAPSHOT) starting
10:12:40,678 INFO  [org.jboss.as] (Controller Boot Thread) WFLYSRV0025: WildFly Core 2.0.0.CR7-SNAPSHOT (WildFly Core 2.0.0.CR7-SNAPSHOT) started in 465ms - Started 35 of 42 services (13 services are lazy, passive or on-demand)
[standalone@embedded /]