check if colourscheme is null

diff --git a/src/jalview/gui/AlignFrame.java b/src/jalview/gui/AlignFrame.java
index c12cf09..80f16a3 100755 (executable)
--- a/src/jalview/gui/AlignFrame.java
+++ b/src/jalview/gui/AlignFrame.java
@@ -808,8 +808,9 @@ public class AlignFrame extends GAlignFrame
     else\r
     {\r
         // MUST NOTIFY THE COLOURSCHEME OF CONSENSUS!\r
-      cs.setConsensus( viewport.vconsensus );\r
-      viewport.setGlobalColourScheme(cs);\r
+        if (cs != null)\r
+          cs.setConsensus(viewport.vconsensus);\r
+        viewport.setGlobalColourScheme(cs);\r
     }\r
 \r
 \r