From: Jim Procter <jprocter@dundee.ac.uk>
Date: Fri, 4 Oct 2024 15:03:38 +0000 (+0100)
Subject: JAL-4470 fix: check for workers!=null before checking its empty...
X-Git-Tag: Release_2_11_4_1~3^2^2~3
X-Git-Url: http://source.jalview.org/gitweb/?a=commitdiff_plain;h=54b1c9efca00df99bc3a502fe76d3bbf98938b96;p=jalview.git

JAL-4470 fix: check for workers!=null before checking its empty...
---

diff --git a/src/jalview/gui/PopupMenu.java b/src/jalview/gui/PopupMenu.java
index f4dd579..31e7cbb 100644
--- a/src/jalview/gui/PopupMenu.java
+++ b/src/jalview/gui/PopupMenu.java
@@ -1779,7 +1779,7 @@ public class PopupMenu extends JPopupMenu implements ColourChangeListener
     List<AlignCalcWorkerI> workers = ap.alignFrame.getViewport()
             .getCalcManager().getRegisteredWorkersOfClass(
                     SecondaryStructureConsensusThread.class);
-    if (!workers.isEmpty())
+    if (workers!=null && !workers.isEmpty())
     {
 
       ap.alignFrame.getViewport().getCalcManager()