From 2c29ce8d19405c32d0a4846538a9facc1f766009 Mon Sep 17 00:00:00 2001
From: Nao Pross <np@0hm.ch>
Date: Sun, 3 Mar 2024 01:09:53 +0100
Subject: Fix PolyIndex.is_constant

---
 mdpoly/types.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mdpoly/types.py b/mdpoly/types.py
index 4b75e8f..a8ffd90 100644
--- a/mdpoly/types.py
+++ b/mdpoly/types.py
@@ -146,8 +146,7 @@ class PolyIndex(tuple[PolyVarIndex]):
     def is_constant(index: Self) -> bool:
         """ Check if is index of a constant term """
         if len(index) != 1:
-            # FIXME: error message
-            raise IndexError(f"{index}")
+            return False
 
         return PolyVarIndex.is_constant(index[0])
 
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