Index: trunk/autoquest-ui-core/src/main/java/de/ugoe/cs/autoquest/commands/usability/CMDmergeSimilarTasks.java
===================================================================
--- trunk/autoquest-ui-core/src/main/java/de/ugoe/cs/autoquest/commands/usability/CMDmergeSimilarTasks.java	(revision 2026)
+++ trunk/autoquest-ui-core/src/main/java/de/ugoe/cs/autoquest/commands/usability/CMDmergeSimilarTasks.java	(revision 2031)
@@ -21,4 +21,5 @@
 import de.ugoe.cs.autoquest.tasktrees.treeifc.ITaskModel;
 import de.ugoe.cs.util.console.Command;
+import de.ugoe.cs.util.console.Console;
 import de.ugoe.cs.util.console.GlobalDataContainer;
 
@@ -72,8 +73,13 @@
         inputTaskModel = (ITaskModel) dataObject;
         
-        ITaskModel taskModel = new TaskTreeManager().mergeSimilarTasks(inputTaskModel);
-        
-        if (GlobalDataContainer.getInstance().addData(inputTaskTreeName, taskModel)) {
-            CommandHelpers.dataOverwritten(inputTaskTreeName);
+        try {
+            ITaskModel taskModel = new TaskTreeManager().mergeSimilarTasks(inputTaskModel);
+            
+            if (GlobalDataContainer.getInstance().addData(inputTaskTreeName, taskModel)) {
+                CommandHelpers.dataOverwritten(inputTaskTreeName);
+            }
+        }
+        catch (Exception e) {
+            Console.logException(e);
         }