From 4faf17681ecb23497054f58147ea7201dfb4c031 Mon Sep 17 00:00:00 2001
From: gmungoc <g.m.carstairs@dundee.ac.uk>
Date: Thu, 8 Aug 2019 10:18:30 +0100
Subject: [PATCH] JAL-3402 suppress unmapped chains in View Chain menu

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

diff --git a/src/jalview/gui/StructureViewerBase.java b/src/jalview/gui/StructureViewerBase.java
index 853ecc1..e7e2967 100644
--- a/src/jalview/gui/StructureViewerBase.java
+++ b/src/jalview/gui/StructureViewerBase.java
@@ -549,6 +549,10 @@ public abstract class StructureViewerBase extends GStructureViewer
     for (String chain : chainNames)
     {
       String seqName = getSequenceNameForChain(chain);
+      if (seqName == null)
+      {
+        continue;
+      }
       int nameLength = seqName.length();
       if (nameLength > 16)
       {
-- 
1.7.10.2