RS resize the chat window

2016-02-23 13:16:22,915 [ajp-nio2-8051-exec-8] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N51-E131 ^%^ org.olat.core.logging 
https://xyz.openolat.com/auth/CourseSite/1#352745

Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0) ^%^ **RedScreen**

<dispatchinfo>
	<componentinfo>
		<compname>vc_index</compname>
		<compclass>org.olat.core.gui.components.velocity.VelocityContainer</compclass>
		<extendedinfo>page:org/olat/core/gui/control/floatingresizabledialog/_content/index.html</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.control.Event</class&gt;
			<command>null</command>
			<tostring>com:null,org.olat.core.gui.control.Event@1f</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.core.gui.control.floatingresizabledialog.FloatingResizableDialogController</controllername>
		<controllername>org.olat.instantMessaging.ui.InstantMessagingMainController</controllername>
		<controllername>org.olat.gui.control.OlatTopNavController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>

>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: null
-> at org.olat.core.gui.exception.ExceptionWindowController.<init>(ExceptionWindowController.java:116)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:57)
   at org.olat.core.gui.exception.MsgFactory.createMessageChiefController(MsgFactory.java:46)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:536)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:234)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:298)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:216)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:289)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:232)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
>>> stack of 2.cause::java.lang.NullPointerException: null
-> at org.olat.core.gui.control.floatingresizabledialog.FloatingResizableDialogController.event(FloatingResizableDialogController.java:174)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:202)
   at org.olat.core.gui.components.AbstractComponent$1.run(AbstractComponent.java:240)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.components.AbstractComponent.fireEvent(AbstractComponent.java:238)
   at org.olat.core.gui.components.velocity.VelocityContainer.doDispatchRequest(VelocityContainer.java:112)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.core.gui.components.Window.doDispatchToComponent(Window.java:1130)
   at org.olat.core.gui.components.Window.dispatchRequest(Window.java:345)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:234)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)