race condition null pointer bugfix

diff --git a/src/jalview/gui/Desktop.java b/src/jalview/gui/Desktop.java
index 1b24694..74a46f7 100755 (executable)
--- a/src/jalview/gui/Desktop.java
+++ b/src/jalview/gui/Desktop.java
@@ -1533,7 +1533,7 @@ public class Desktop extends jalview.jbgui.GDesktop implements
 
     public void paintComponent(Graphics g)
     {
-      if (showMemoryUsage)
+      if (showMemoryUsage && g!=null)
       {
         if (percentUsage < 20)
           g.setColor(Color.red);