From 0caadd215e72d633cc8244af82e5c974fdbd2afd Mon Sep 17 00:00:00 2001
From: Shawn Douglas <shawn.douglas@gmail.com>
Date: Tue, 14 Dec 2021 09:54:31 -0800
Subject: [PATCH] Bump to 2.4.1

---
 cadnano2/model/parts/part.py | 3 +++
 setup.py                     | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/cadnano2/model/parts/part.py b/cadnano2/model/parts/part.py
index 9d5e03b..bdddc55 100755
--- a/cadnano2/model/parts/part.py
+++ b/cadnano2/model/parts/part.py
@@ -1120,6 +1120,9 @@ def potentialCrossoverList(self, virtualHelix, idx=None):
             baseRange = [x for x in baseRange if x >= idx - 3 * part._step and \
                                         x <= idx + 2 * part._step]
 
+        if vh is None:
+            return
+
         fromStrandSets = vh.getStrandSets()
         neighbors = self.getVirtualHelixNeighbors(vh)
 
diff --git a/setup.py b/setup.py
index cf9d028..266840a 100644
--- a/setup.py
+++ b/setup.py
@@ -2,7 +2,7 @@
 
 setup(
     name='cadnano2',
-    version='2.4.0',    
+    version='2.4.1',    
     description='Cadnano2 for PyQt6',
     url='https://github.com/douglaslab/cadnano2',
     author='Shawn Douglas',