From 57e4f6ff8a5e42f74c6ae2a6401ab498ce4aeb2b Mon Sep 17 00:00:00 2001
From: Mateusz Rezler <mateuszrezler@gmail.com>
Date: Tue, 1 Sep 2020 01:48:50 +0200
Subject: [PATCH] Issue #14 fixed

---
 generation/poly_hgraph/mol_graph.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/generation/poly_hgraph/mol_graph.py b/generation/poly_hgraph/mol_graph.py
index 39f7afd..d827644 100644
--- a/generation/poly_hgraph/mol_graph.py
+++ b/generation/poly_hgraph/mol_graph.py
@@ -13,7 +13,7 @@ class MolGraph(object):
 
     BOND_LIST = [Chem.rdchem.BondType.SINGLE, Chem.rdchem.BondType.DOUBLE, Chem.rdchem.BondType.TRIPLE, Chem.rdchem.BondType.AROMATIC] 
     MAX_POS = 20
-    FRAGMENTS = None
+    FRAGMENTS = []
 
     @staticmethod
     def load_fragments(fragments):