set seqColours null

diff --git a/src/jalview/gui/TreeCanvas.java b/src/jalview/gui/TreeCanvas.java
index 57e652c..6f60792 100755 (executable)
--- a/src/jalview/gui/TreeCanvas.java
+++ b/src/jalview/gui/TreeCanvas.java
@@ -764,7 +764,7 @@ public class TreeCanvas extends JPanel implements MouseListener, Runnable,
 \r
                 av.setSelectionGroup(null);\r
                 av.alignment.deleteAllGroups();\r
-                av.sequenceColours.clear();\r
+                av.sequenceColours=null;\r
 \r
                 colourGroups();\r
               }\r