From a9600fed9eed810ace9fd5a5f1ad3594b598c527 Mon Sep 17 00:00:00 2001
From: Chris Maffeo <cmaffeo2@illinois.edu>
Date: Wed, 3 Jul 2019 13:44:18 -0500
Subject: [PATCH] Small fix for 0-length ssDNA segments
---
mrdna/segmentmodel.py | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mrdna/segmentmodel.py b/mrdna/segmentmodel.py
index ad49d12..3e19782 100644
--- a/mrdna/segmentmodel.py
+++ b/mrdna/segmentmodel.py
@@ -2514,6 +2514,9 @@ class SegmentModel(ArbdModel):
if b1 is b2:
return
+ if b1 is None or b2 is None:
+ return
+
## TODO: improve parameters
if add_bond:
pot = self.get_bond_potential(4,12)
--
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