NPE in Vaadin 7 Beta 10

Vaadin 6 / 7 / 8
1

I am getting following error in Beta 10. Any idea?

Caused by: java.lang.NullPointerException
at com.vaadin.server.GlobalResourceHandler.unregisterConnector(GlobalResourceHandler.java:215)
at com.vaadin.ui.ConnectorTracker.removeFromGlobalResourceHandler(ConnectorTracker.java:163)
at com.vaadin.ui.ConnectorTracker.unregisterConnector(ConnectorTracker.java:152)
at com.vaadin.server.AbstractClientConnector.detach(AbstractClientConnector.java:624)
at com.vaadin.ui.AbstractComponent.detach(AbstractComponent.java:560)
at com.vaadin.server.AbstractClientConnector.detach(AbstractClientConnector.java:619)
at com.vaadin.ui.AbstractComponent.detach(AbstractComponent.java:560)
at com.vaadin.server.AbstractClientConnector.detach(AbstractClientConnector.java:619)
at com.vaadin.ui.AbstractComponent.detach(AbstractComponent.java:560)
at com.vaadin.server.AbstractClientConnector.setParent(AbstractClientConnector.java:578)
at com.vaadin.ui.AbstractComponent.setParent(AbstractComponent.java:450)
at com.vaadin.ui.AbstractComponentContainer.removeComponent(AbstractComponentContainer.java:229)
at com.vaadin.ui.AbstractOrderedLayout.removeComponent(AbstractOrderedLayout.java:162)
… 30 more

2

Bounty…anybody???