Index: /trunk/autoquest-ui-swt/src/main/java/de/ugoe/cs/autoquest/ui/swt/ShowTaskTreeDialog.java
===================================================================
--- /trunk/autoquest-ui-swt/src/main/java/de/ugoe/cs/autoquest/ui/swt/ShowTaskTreeDialog.java	(revision 1184)
+++ /trunk/autoquest-ui-swt/src/main/java/de/ugoe/cs/autoquest/ui/swt/ShowTaskTreeDialog.java	(revision 1185)
@@ -283,6 +283,8 @@
             TreeItem[] items = parent.getItems();
             if ((items == null) || (items.length == 0) || (items[0].getData() == null)) {
-                for (int i = 0; i < items.length; i++) {
-                    items[i].dispose();
+                if (items != null) {
+                    for (int i = 0; i < items.length; i++) {
+                        items[i].dispose();
+                    }
                 }