--- a/DSVColumnView.st	Fri Jun 06 19:57:55 2003 +0200
+++ b/DSVColumnView.st	Wed Jun 11 10:33:27 2003 +0200
@@ -934,7 +934,9 @@
         preferredExtent := nil
     ] ifTrue:[
         aList size ~~ 0 ifTrue:[  "/ otherwise keep old values
-            columnDescriptors do:[:aCol| aCol invalidate ].
+            columnDescriptors notNil ifTrue:[
+                columnDescriptors do:[:aCol| aCol invalidate ].
+            ].
             preferredExtent := nil.
         ]
     ].
@@ -3870,5 +3872,5 @@
 !DSVColumnView class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libwidg2/DSVColumnView.st,v 1.169 2003-06-06 17:57:55 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libwidg2/DSVColumnView.st,v 1.170 2003-06-11 08:33:27 cg Exp $'
 ! !