diff --git a/trees/bst_is_valid.py b/trees/bst_is_valid.py
index ebf356e..3ff3199 100644
--- a/trees/bst_is_valid.py
+++ b/trees/bst_is_valid.py
@@ -14,10 +14,8 @@ def is_valid_bst_iterative(root):
             if node:
                 if min_val >= node.val or node.val >= max_val:
                     return False
-                if node.left:
-                    queue.append((node.left, min_val, node.val))
-                if node.right:
-                    queue.append((node.right, node.val, max_val))
+                queue.append((node.left, min_val, node.val))
+                queue.append((node.right, node.val, max_val))
         
         return True