MutateOrganization breaks with multiple entries

[teh]

Sep 07 10:11:58 api java[26165]: ERROR [2015-09-07 10:11:58,535Z] co.mitro.core.servlets.MitroServlet: unhandled exception (exceptionId:1ecooif); returning error code 500:
Sep 07 10:11:58 api java[26165]: co.mitro.core.exceptions.MitroServletException: Operation would create duplicate members: 6,7
Sep 07 10:11:58 api java[26165]: at co.mitro.core.servlets.MutateOrganization.processCommand(MutateOrganization.java:143)
Sep 07 10:11:58 api java[26165]: at co.mitro.core.servlets.MitroServlet.doPost(MitroServlet.java:411)
Sep 07 10:11:58 api java[26165]: at javax.servlet.http.HttpServlet.service(HttpServlet.java:688)
Sep 07 10:11:58 api java[26165]: at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:681)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:452)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1083)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:379)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1017)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:136)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:109)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
Sep 07 10:11:58 api java[26165]: at com.codahale.metrics.jetty9.InstrumentedHandler.handle(InstrumentedHandler.java:170)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.Server.handle(Server.java:445)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:260)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:225)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.io.AbstractConnection$ReadCallback.run(AbstractConnection.java:358)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:596)
Sep 07 10:11:58 api java[26165]: at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:527)
Sep 07 10:11:58 api java[26165]: at java.lang.Thread.run(Thread.java:745)