From 0a2ec403c08a1747b7e876f00f468867f8329d36 Mon Sep 17 00:00:00 2001
From: gmungoc <g.m.carstairs@dundee.ac.uk>
Date: Thu, 8 Oct 2020 15:29:24 +0100
Subject: [PATCH] JAL-3763 failsafe check for null

---
 src/jalview/datamodel/AlignedCodonFrame.java |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/jalview/datamodel/AlignedCodonFrame.java b/src/jalview/datamodel/AlignedCodonFrame.java
index d59078b..5240f0c 100644
--- a/src/jalview/datamodel/AlignedCodonFrame.java
+++ b/src/jalview/datamodel/AlignedCodonFrame.java
@@ -170,6 +170,10 @@ public class AlignedCodonFrame
       int[] codon = null;
       SequenceI mappedSeq = null;
       SequenceI ds = seq.getDatasetSequence();
+      if (ds == null)
+      {
+        ds = seq;
+      }
       
       if (this.fromSeq == seq || this.fromSeq == ds)
       {
-- 
1.7.10.2