diff --git a/src/org/gcube/vremanagement/vremodeler/db/DBInterface.java b/src/org/gcube/vremanagement/vremodeler/db/DBInterface.java
index d90a52e..0c972c8 100644
--- a/src/org/gcube/vremanagement/vremodeler/db/DBInterface.java
+++ b/src/org/gcube/vremanagement/vremodeler/db/DBInterface.java
@@ -94,17 +94,18 @@ public class DBInterface {
         
         for (List<String> row: values)
         {
-        
+        	if (row==null) System.out.println("Why row is null ?? "+table);
         	insertQuery=new StringBuffer();
         	insertQuery.append("INSERT INTO ").append(table.toUpperCase()).append(" VALUES(");
         	try{
         		        		
         		for(String value: row){
+        			if (value==null) System.out.println("Why value is null ?? "+table);
         			insertQuery.append("'").append(value.replaceAll("'", " ")).append("',");
         		}
         		        		        
         		insertQuery.deleteCharAt(insertQuery.length()-1).append(");");
-        		//logger.debug(insertQuery);
+        		logger.trace("Query for inserting in hsqldb "+insertQuery);
         		        	
         		 st.executeUpdate(insertQuery.toString());    // run the query
         	}catch(SQLException e){logger.error("HSQLDB ERROR: Problem inserting data "+e.getMessage()+" --   "+ insertQuery);
diff --git a/src/org/gcube/vremanagement/vremodeler/db/IStoDBUtil.java b/src/org/gcube/vremanagement/vremodeler/db/IStoDBUtil.java
index 758b424..a8d318d 100644
--- a/src/org/gcube/vremanagement/vremodeler/db/IStoDBUtil.java
+++ b/src/org/gcube/vremanagement/vremodeler/db/IStoDBUtil.java
@@ -179,6 +179,7 @@ public class IStoDBUtil {
 				for (GCUBECollection col: collectionList ){
 					row= new ArrayList<String>(6);
 					row.add(col.getID());
+					System.out.println(col.getID());
 					row.add(col.getName());
 					row.add(col.getDescription());
 					row.add(col.getNumberOfMembers()+"");