NPE in agent.exclude

gistfile1.txt

java.lang.NullPointerException
	at com.barchart.feed.base.provider.MarketProviderBase.unsubscribe(MarketProviderBase.java:691)
	at com.barchart.feed.base.provider.MarketProviderBase.unsubscribe(MarketProviderBase.java:714)
	at com.barchart.feed.base.provider.MarketProviderBase.access$1000(MarketProviderBase.java:62)
	at com.barchart.feed.base.provider.MarketProviderBase$BaseAgent.exclude(MarketProviderBase.java:567)
	at com.barchart.plugin.trader.core.book.ui.BookTraderView.changeSymbol(BookTraderView.java:2960)
	at com.barchart.plugin.trader.core.book.BookTraderWidget.onSymbolChange(BookTraderWidget.java:135)
	at com.barchart.plugin.core.impl.space.flexi.ui.FlexStackPane.doSymbolChange(FlexStackPane.java:1044)
	at com.barchart.plugin.core.impl.space.flexi.ui.FlexStackPane.keyPressed(FlexStackPane.java:450)
	at com.barchart.plugin.core.impl.space.flexi.ui.FlexStackPane$1.keyPressed(FlexStackPane.java:936)
	at org.apache.pivot.wtk.Component$ComponentKeyListenerList.keyPressed(Component.java:577)
	at org.apache.pivot.wtk.Component.keyPressed(Component.java:2915)
	at org.apache.pivot.wtk.ApplicationContext$DisplayHost.processKeyEvent(ApplicationContext.java:1475)
	at java.awt.Component.processEvent(Component.java:6282)
	at org.apache.pivot.wtk.ApplicationContext$DisplayHost.processEvent(ApplicationContext.java:851)
	at java.awt.Component.dispatchEventImpl(Component.java:4861)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1895)
	at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:762)
	at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1027)
	at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:899)
	at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:727)
	at java.awt.Component.dispatchEventImpl(Component.java:4731)
	at java.awt.Container.dispatchEventImpl(Container.java:2287)
	at java.awt.Window.dispatchEventImpl(Window.java:2719)
	at java.awt.Component.dispatchEvent(Component.java:4687)
	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
	at java.awt.EventQueue.access$200(EventQueue.java:103)
	at java.awt.EventQueue$3.run(EventQueue.java:694)
	at java.awt.EventQueue$3.run(EventQueue.java:692)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.awt.EventQueue$4.run(EventQueue.java:708)
	at java.awt.EventQueue$4.run(EventQueue.java:706)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)