if image is null, repaint

diff --git a/src/jalview/gui/SeqCanvas.java b/src/jalview/gui/SeqCanvas.java
index 698489e..6dc2acd 100755 (executable)
--- a/src/jalview/gui/SeqCanvas.java
+++ b/src/jalview/gui/SeqCanvas.java
@@ -115,7 +115,7 @@ public class SeqCanvas extends JPanel
 \r
 public void fastPaint(int horizontal, int vertical)\r
 {\r
-    if (horizontal == 0 && vertical == 0)\r
+    if (horizontal == 0 && vertical == 0 || gg==null)\r
       return;\r
 \r
     gg.copyArea(0, 0, imgWidth, imgHeight, -horizontal * av.charWidth,\r