diff --git a/src/main/java/org/gcube/application/perform/service/engine/model/importer/ImportedTable.java b/src/main/java/org/gcube/application/perform/service/engine/model/importer/ImportedTable.java
index f575f78..9af291b 100644
--- a/src/main/java/org/gcube/application/perform/service/engine/model/importer/ImportedTable.java
+++ b/src/main/java/org/gcube/application/perform/service/engine/model/importer/ImportedTable.java
@@ -172,7 +172,10 @@ public class ImportedTable {
 		for(Entry<String,String> csvField:csvRow.entrySet()) {
 			DBField toSetField=labels.get(csvField.getKey());
 
-			Object value=csvField.getValue();		
+			Object value=csvField.getValue();	
+			if(csvField.getValue()==null
+					||csvField.getValue().isEmpty()) value=null;
+			
 			if(value!=null)
 				try {
 					switch(toSetField.getType()) {