JAL-3048 check for headless

diff --git a/src/jalview/gui/ImageExporter.java b/src/jalview/gui/ImageExporter.java
index 1f83b7c..fc971e2 100644 (file)
--- a/src/jalview/gui/ImageExporter.java
+++ b/src/jalview/gui/ImageExporter.java
@@ -210,7 +210,7 @@ public class ImageExporter
    */
   void setStatus(String msg, long id)
   {
-    if (messageBoard != null)
+    if (messageBoard != null && !Jalview.isHeadlessMode())
     {
       messageBoard.setProgressBar(msg, id);
     }