diff --git a/src/main/java/org/gcube/contentmanagement/blobstorage/transport/backend/operation/SoftCopyOperator.java b/src/main/java/org/gcube/contentmanagement/blobstorage/transport/backend/operation/SoftCopyOperator.java
index 971c338..f94fecf 100644
--- a/src/main/java/org/gcube/contentmanagement/blobstorage/transport/backend/operation/SoftCopyOperator.java
+++ b/src/main/java/org/gcube/contentmanagement/blobstorage/transport/backend/operation/SoftCopyOperator.java
@@ -26,6 +26,7 @@ import org.slf4j.LoggerFactory;
 import com.mongodb.BasicDBObject;
 import com.mongodb.DBCollection;
 import com.mongodb.DBObject;
+import com.mongodb.DuplicateKeyException;
 import com.mongodb.gridfs.GridFSDBFile;
 
 /**
@@ -225,8 +226,20 @@ public class SoftCopyOperator extends SoftCopy {
 		document.put("length", sourceObject.getLength());
 		// set chunkSize inherited from original object	
 		document.put("chunkSize", sourceObject.getChunkSize());
-		metaCollectionInstance.insert(document);
-		metaCollectionInstance.save(document);
+		try {
+			metaCollectionInstance.insert(document);
+			metaCollectionInstance.save(document);			
+		}catch (DuplicateKeyException e) {
+			logger.warn("key already present or not completely removed. Wait few seconds and retry");
+			try {
+				Thread.sleep(2000);
+			} catch (InterruptedException e1) {
+				// TODO Auto-generated catch block
+				e1.printStackTrace();
+			}
+			metaCollectionInstance.insert(document);
+			metaCollectionInstance.save(document);	
+		}
 		return document;
 	}