From 09af5cd382fe2ce9f5ce1a9641615552c96fed51 Mon Sep 17 00:00:00 2001
From: gmungoc <g.m.carstairs@dundee.ac.uk>
Date: Wed, 6 Sep 2017 16:03:47 +0100
Subject: [PATCH] JAL-2721 no fastPaint if img has been nulled by fontChanged!

---
 src/jalview/gui/SeqCanvas.java |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/jalview/gui/SeqCanvas.java b/src/jalview/gui/SeqCanvas.java
index 191a7d8..4e896a0 100755
--- a/src/jalview/gui/SeqCanvas.java
+++ b/src/jalview/gui/SeqCanvas.java
@@ -283,7 +283,7 @@ public class SeqCanvas extends JComponent implements ViewportListenerI
    */
   public void fastPaint(int horizontal, int vertical)
   {
-    if (fastpainting || gg == null)
+    if (fastpainting || gg == null || img == null)
     {
       return;
     }
-- 
1.7.10.2