Custom root app is causing issues when root location is still on

Deploying a custom root app is causing issues when root location is still on.
Root application seems to have priority to the location. However, when unregistering node(shutdown), node is sending remove-app request twice.

2017-07-24 14:50:56,393 INFO  [io.undertow] (default task-25) UT005047: Unregistering context /, from node jboss-eap-7.1-1
2017-07-24 14:50:56,439 INFO  [io.undertow] (default task-28) UT005047: Unregistering context /, from node jboss-eap-7.1-1

Once for the app and once for the location.
This is throwing error

2017-07-24 14:50:56,441 ERROR [io.undertow] (default task-28) UT005043: Error in processing MCMP commands: Type:MEM, Mess: MEM: Can't update or insert context

Reproduce:

1. Set up undertow balancer with one worker
2. Deploy a custom root app to the worker

    //jboss-web.xml
   <jboss-web>
       <context-root>/</context-root>
   </jboss-web>

3. Turn off the worker and watch the logs