diff --git a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/editor/WTableDirEditor.java b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/editor/WTableDirEditor.java
index 4fe8993911..a84906432f 100644
--- a/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/editor/WTableDirEditor.java
+++ b/org.adempiere.ui.zk/WEB-INF/src/org/adempiere/webui/editor/WTableDirEditor.java
@@ -244,6 +244,8 @@ ContextMenuListener, IZoomableEditor
             retVal = selItem.getValue();
             if ((retVal instanceof Integer) && (Integer)retVal == -1)
             	retVal = null;
+            else if ((retVal instanceof String) && "".equals(retVal))
+            	retVal = null;
         }
         return retVal;
     }