diff --git a/datastore_server/source/java/ch/systemsx/cisd/etlserver/TransferredDataSetHandler.java b/datastore_server/source/java/ch/systemsx/cisd/etlserver/TransferredDataSetHandler.java
index 6bb9fa47096a4e40c26b9258d9245be88bb0bd08..d5ef3778cd6bbc9c109e9f88d7a653c997348d14 100644
--- a/datastore_server/source/java/ch/systemsx/cisd/etlserver/TransferredDataSetHandler.java
+++ b/datastore_server/source/java/ch/systemsx/cisd/etlserver/TransferredDataSetHandler.java
@@ -526,7 +526,6 @@ public final class TransferredDataSetHandler implements IPathHandler, ISelfTesta
                     errorMessageTemplate = DATA_SET_REGISTRATION_FAILURE_TEMPLATE;
                     plainRegisterDataSet(data, relativePath, availableFormat, isCompleteFlag);
                     clean();
-                    clean();
                     if (processorOrNull == null)
                     {
                         return;