EAP 6 fails to start our deployment because of "IllegalArgumentException: Child container with name already exists"

Issue

• JBoss fails to deploy our application with the following error:

ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC000001: Failed to start service jboss.web.deployment.default-host./: org.jboss.msc.service.StartException in service jboss.web.deployment.default-host./: Failed to start service
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1767) [jboss-msc-1.0.2.GA-redhat-1.jar:1.0.2.GA-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [rt.jar:1.6.0_34]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [rt.jar:1.6.0_34]
        at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_34]
Caused by: java.lang.IllegalArgumentException: Child container with name  already exists
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:805)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:793)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:356)
        at org.jboss.as.web.deployment.WebContextInjector.inject(WebContextInjector.java:62)