From 399e1d3f420de471ccca803044df0b2fb07518c6 Mon Sep 17 00:00:00 2001
From: Nao Pross <np@0hm.ch>
Date: Fri, 8 Mar 2024 02:30:50 +0100
Subject: Fix missing edge case in Expr.children

---
 mdpoly/abc.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mdpoly/abc.py b/mdpoly/abc.py
index 36cb1c3..14026d6 100644
--- a/mdpoly/abc.py
+++ b/mdpoly/abc.py
@@ -120,6 +120,8 @@ class Expr(ABC):
 
     def children(self) -> Sequence[Expr]:
         """ Iterate over the two nodes """
+        if self.is_leaf:
+            return tuple()
         return self.left, self.right
 
     def leaves(self) -> Iterable[Expr]:
-- 
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