diff --git a/seminar/treelib.py b/seminar/treelib.py
index fe4ebce0..9482079a 100644
--- a/seminar/treelib.py
+++ b/seminar/treelib.py
@@ -443,7 +443,6 @@ def disconnect_node(node):
 	# Jsme neprvním synem
 	prev = node.prev
 	prev.succ = node.succ
-	node.prev = None
 	node.succ = None
 	node.save()
 	clear_root(node)