diff --git a/libs/ui/source/element.cpp b/libs/ui/source/element.cpp
index d1d1264d..f041079e 100644
--- a/libs/ui/source/element.cpp
+++ b/libs/ui/source/element.cpp
@@ -9,7 +9,9 @@ namespace psemek::ui
 
 	void element::set_parent(element * parent)
 	{
-		if (!parent_ && parent && reshape_posted_)
+		assert(!parent_ || !parent);
+
+		if (parent && reshape_posted_)
 			parent->post_reshape();
 
 		parent_ = parent;