diff --git a/Accessible.gd b/Accessible.gd
index ec2efbb..0b54203 100644
--- a/Accessible.gd
+++ b/Accessible.gd
@@ -499,7 +499,6 @@ func unfocused():
     if not node.get_focus_owner():
         node.get_tree().root.warp_mouse(node.rect_global_position)
     timer.unreference()
-    timer = null
 
 func click_focused():
     if node.has_focus():
@@ -626,4 +625,8 @@ func _init(node):
             node.connect("cell_selected", self, "tree_item_selected")
         else:
             node.connect("item_selected", self, "tree_item_selected")
-    node.connect("tree_exiting", self, "free", [], Object.CONNECT_DEFERRED)
+    node.connect("tree_exiting", self, "queue_free", [], Object.CONNECT_DEFERRED)
+
+func _exit_tree():
+    if timer != null:
+        timer.unreference()
diff --git a/ScreenReader.gd b/ScreenReader.gd
index 96bf01f..2050d25 100644
--- a/ScreenReader.gd
+++ b/ScreenReader.gd
@@ -3,8 +3,6 @@ extends Node
 
 var Accessible = preload("Accessible.gd")
 
-var accessibles = []
-
 var focus_restore_timer = Timer.new()
 
 func focused(node):
@@ -26,7 +24,7 @@ func unfocused(node):
 func augment_node(node):
     if node is Control:
         var accessible = Accessible.new(node)
-        accessibles.append(accessible)
+        add_child(accessible)
         if not node.is_connected("focus_entered", self, "focused"):
             node.connect("focus_entered", self, "focused", [node])
         if not node.is_connected("mouse_entered", self, "click_focused"):
@@ -37,6 +35,8 @@ func augment_node(node):
             node.connect("mouse_exited", self, "unfocused", [node])
 
 func augment_tree(node):
+    if node is Accessible:
+        return
     augment_node(node)
     for child in node.get_children():
         augment_tree(child)
@@ -75,10 +75,3 @@ func _enter_tree():
     focus_restore_timer.connect("timeout", self, "restore_focus")
     add_child(focus_restore_timer)
     get_tree().connect("node_added", self, "augment_tree")
-
-func _exit_tree():
-    for accessible in accessibles:
-        if accessible.timer != null:
-            accessible.timer.unreference()
-            accessible.timer = null
-        accessible.free()