TypeError: Error #1009: Cannot access a property or method of a null object reference.
	at com.progrestar.game.ui.message.invite_friends_window::InviteFriendsWindow/unLoad()[D:\work\epicwar\com\progrestar\game\ui\message\invite_friends_window\InviteFriendsWindow.as:119]
	at com.progrestar.common.managers::DialogManager$/removeDialog()[D:\work\common\com\progrestar\common\managers\DialogManager.as:334]
	at com.progrestar.common.message::Dialog/closeComplete()[D:\work\common\com\progrestar\common\message\Dialog.as:295]
	at com.progrestar.common.message::Dialog/close()[D:\work\common\com\progrestar\common\message\Dialog.as:289]
	at com.progrestar.game.ui.message::GameDialog/close()[D:\work\epicwar\com\progrestar\game\ui\message\GameDialog.as:249]
	at com.progrestar.game.ui.message::GameDialog/onMouseDown()[D:\work\epicwar\com\progrestar\game\ui\message\GameDialog.as:471]