Index: trunk/autoquest-core-tasktrees/src/main/java/de/ugoe/cs/autoquest/tasktrees/treeimpl/TaskModel.java
===================================================================
--- trunk/autoquest-core-tasktrees/src/main/java/de/ugoe/cs/autoquest/tasktrees/treeimpl/TaskModel.java	(revision 1947)
+++ trunk/autoquest-core-tasktrees/src/main/java/de/ugoe/cs/autoquest/tasktrees/treeimpl/TaskModel.java	(revision 1948)
@@ -151,4 +151,5 @@
     @Override
     public String toString() {
+        ensureInitialized();
         return "Task Model (" + userSessions.size() + " sessions, " + index.taskMap.size() +
             " tasks, hash " + System.identityHashCode(this) + ")";