Lazy loading issue in delete process

2016-09-22 10:42:23,141 [ajp-nio2-8004-exec-154] ERROR OLATRuntimeException - OLAT::ERROR ^%^ N4-E93 

Mozilla/5.0 (Windows NT 6.1; PIA; Trident/7.0; rv:11.0) like Gecko ^%^ **RedScreen** could not initialize proxy - no Session

<dispatchinfo>
	<componentinfo>
		<compname>ffo_main_null</compname>
		<compclass>org.olat.core.gui.components.form.flexible.impl.FormWrapperContainer</compclass>
		<extendedinfo>n/a</extendedinfo>
		<event>
			<class&gt;org.olat.core.gui.control.Event</class&gt;
			<command>validation ok</command>
			<tostring>com:validation ok,org.olat.core.gui.control.Event@d62b3f02</tostring>
		</event>
	</componentinfo>
	<controllerinfo>
		<controllername>org.olat.core.util.mail.MailTemplateForm</controllername>
		<controllername>org.olat.admin.user.delete.SelectionController</controllername>
		<controllername>org.olat.admin.user.delete.TabbedPaneController</controllername>
		<controllername>org.olat.admin.UserAdminMainController</controllername>
		<controllername>org.olat.core.commons.fullWebApp.BaseFullWebappController</controllername>
	</controllerinfo>
</dispatchinfo>

>>> stack of 1.cause::org.olat.core.logging.OLATRuntimeException: could not initialize proxy - no Session
-> 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:547)
   at org.olat.core.gui.components.Window.doDispatchRequest(Window.java:240)
   at org.olat.core.gui.components.AbstractComponent.dispatchRequest(AbstractComponent.java:193)
   at org.olat.dispatcher.AuthenticatedDispatcher.processValidDispatchURI(AuthenticatedDispatcher.java:275)
   at org.olat.dispatcher.AuthenticatedDispatcher.execute(AuthenticatedDispatcher.java:192)
   at org.olat.core.servlets.OpenOLATServlet.executeUserRequest(OpenOLATServlet.java:292)
   at org.olat.core.servlets.OpenOLATServlet.doPost(OpenOLATServlet.java:235)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
>>> stack of 2.cause::org.hibernate.LazyInitializationException: could not initialize proxy - no Session
-> at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:147)
   at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:260)
   at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:68)
   at org.olat.user.UserImpl_$$_jvst72_14.getPreferences(UserImpl_$$_jvst72_14.java)
   at org.olat.admin.user.delete.service.UserDeletionManager.sendUserDeleteEmailTo(UserDeletionManager.java:164)
   at org.olat.admin.user.delete.SelectionController.event(SelectionController.java:170)
   at org.olat.core.gui.control.DefaultController$1.run(DefaultController.java:246)
   at org.olat.core.logging.activity.ThreadLocalUserActivityLoggerInstaller.runWithUserActivityLogger(ThreadLocalUserActivityLoggerInstaller.java:108)
   at org.olat.core.gui.control.DefaultController.dispatchEvent(DefaultController.java:243)
   at org.olat.core.gui.control.DefaultController.fireEvent(DefaultController.java:190)
   at org.olat.core.util.mail.MailNotificationEditController.event(MailNotificationEditController.java:94)