diff --git a/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java b/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
index 4a55ba9..250da23 100644
--- a/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
+++ b/src/main/java/org/gcube/portal/databook/server/DBCassandraAstyanaxImpl.java
@@ -2088,7 +2088,8 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 		}
 
 		//if there are no settings for this user create an entry and put all of them at true
-		if (result.all().isEmpty()) {
+		List<Row> results = result.all();
+		if (results.isEmpty()) {
 			_log.info("Userid " + userid + " settings not found, initiating its preferences...");
 			HashMap<NotificationType, NotificationChannelType[]> toCreate = new HashMap<NotificationType, NotificationChannelType[]>();
 
@@ -2108,7 +2109,7 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 		}
 		else {
 			_log.trace("Notification preferences Found for  " + userid);
-			for (Row row: result.all()){
+			for (Row row: results){
 				String[] channels = row.getString(PREFERENCE).split(",");
 				if (channels != null && channels.length == 1 && channels[0].toString().equals("") ) { //it is empty, preference is set to no notification at all
 					toReturn.put(getNotificationType(row.getString(TYPE)), new NotificationChannelType[0]);
@@ -2190,11 +2191,11 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 				.build());
 		try {
 			result = session.execute(stmtFind.bind(UUID.fromString(commentId)));
-
-			if (result.all().isEmpty()) {
+			toReturn = readCommentFromRow(result.one());
+			if (toReturn==null) {
 				throw new CommentIDNotFoundException("The requested commentId: " + commentId + " is not existing");
 			}
-			toReturn = readCommentFromRow(result.one());
+
 		} catch (Exception e){
 			e.printStackTrace();
 		}
@@ -2284,9 +2285,9 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 		try {
 			result = session.execute(stmtFind.bind());
 
-
-			if (!result.all().isEmpty()){
-				result.all().parallelStream().forEach( row->{
+			List<Row> results = result.all();
+			if (!results.isEmpty()){
+				results.parallelStream().forEach( row->{
 							if(row.getString(USER_ID).equals(userid)){
 								try{
 									Comment c = readCommentById(row.getUuid(COMMENT_ID).toString());
@@ -3065,10 +3066,11 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 				.build());
 		try {
 			result = session.execute(stmtFind.bind(UUID.fromString(inviteid)));
-			if (result.one() == null) {
+			toReturn = readAInviteFromRow(result.one());
+			if (toReturn == null) {
 				throw new InviteStatusNotFoundException("The requested inviteid: " + inviteid + " is not existing");
 			}
-			toReturn = readAInviteFromRow(result.one());
+			//toReturn = readAInviteFromRow(result.all().get(0));
 
 		} catch (Exception e){
 			e.printStackTrace();
@@ -3637,7 +3639,7 @@ public final class DBCassandraAstyanaxImpl implements DatabookStore {
 				.selectFrom(VRE_TIMELINE_POSTS).column(VRE_ID).all()
 				.build());
 		try {
-			result = session.execute(stmtFind.getQuery());
+			result = session.execute(stmtFind.bind());
 
 		} catch (Exception e){
 			e.printStackTrace();