diff --git a/ajax/otpoll.php b/ajax/otpoll.php
index 32d88036..509e50fc 100644
--- a/ajax/otpoll.php
+++ b/ajax/otpoll.php
@@ -62,7 +62,6 @@ try{
 			break;
 		case 'sync-ops':
 			$seqHead = $request->getParam('args/seq_head');
-
 			if (!is_null($seqHead)){
 				$esId = $request->getParam('args/es_id');
 				$memberId = $request->getParam('args/member_id');
@@ -70,25 +69,39 @@ try{
 
 				$currentHead = OCA\Office\Op::getHeadSeq($esId);
 
-				if (!$currentHead || $seqHead == $currentHead) { // very first ops || match the current head
-					// Add incoming ops, response with a new head
-					foreach ($ops as $op) {
-						$op['opspec'] = json_encode($op['opspec']);
-						$lastSeq = OCA\Office\Op::add($op);
+				// TODO handle the case ($currentHead == "") && ($seqHead != "")
+
+				if ($seqHead == $currentHead) {
+					// matching heads
+					if (count($ops) > 0) {
+						// incoming ops without conflict
+						// Add incoming ops, respond with a new head
+						$lastSeq = $currentHead; // empty op stack
+						foreach ($ops as $op) {
+							$op['opspec'] = json_encode($op);
+							$op['member'] = $memberId;
+							$lastSeq = OCA\Office\Op::add($esId, $op);
+						}
+						$response["result"] = 'added';
+						$response["headSeq"] = $lastSeq;
+					} else {
+						// no incoming ops (just checking for new ops...)
+						$response["result"] = 'newOps';
+						$response["ops"] = [];
+						$response["headSeq"] = $currentHead;
 					}
-					$response["result"] = 'added';
-					$response["headSeq"] = $lastSeq;
-				} else {
-					//     result: 'conflict',
-					//     ops: a list of all ops since  $postobject['args']['seq_head']
-					//     headSeq: the most recent op-seq
-					$response["result"] = 'conflict';
+				} else { // HEADs do not match
 					$response["ops"] = OCA\Office\Op::getOpsAfter($esId, $seqHead);
-					$last = end($response["ops"]);
-					$response["headSeq"] = $last['seq'];
+					$response["headSeq"] = $currentHead;
+					if (count($ops) > 0) { // a conflict
+						$response["result"] = 'conflict';
+					} else { // not a conflict
+						$response["result"] = 'newOps';
+
+					}
 				}
 			} else {
-				// Error - empty seq_head passed :)
+				// Error - no seq_head passed
 				throw new BadRequestException();
 			}
 
diff --git a/lib/op.php b/lib/op.php
index 352236db..2aa31fda 100644
--- a/lib/op.php
+++ b/lib/op.php
@@ -4,19 +4,21 @@ namespace OCA\Office;
 
 class Op {
 
-	public static function add($op){
+	public static function add($esId, $op){
 		$query = \OCP\DB::prepare('INSERT INTO `*PREFIX*office_op`  (`es_id`, `member`, `opspec`) VALUES (?, ?, ?) ');
 		$query->execute(array(
-		$result = $op['es_id'],
+			$esId,
 			$op['member'],
 			$op['opspec'],
 		));
-		if ($result){
-			return \OCP\DB::insertid(`*PREFIX*office_op`);
-		}
-		return 0;
+		// throw something - if query fails - thats fatal
+
+		return \OCP\DB::insertid(`*PREFIX*office_op`);
 	}
 	
+	/**
+	 * @returns "" when there are no Ops, or the seq of the last Op
+	 */
 	public static function getHeadSeq($esId){
 		$query = \OCP\DB::prepare('SELECT `seq` FROM `*PREFIX*office_op`  WHERE `es_id`=? ORDER BY `seq` DESC LIMIT 1');
 		$result = $query->execute(array(
@@ -24,17 +26,18 @@ class Op {
 			))
 			->fetchOne()	
 		;
-		return $result;
+		return is_null($result) ? "" : $result;
 	}
 	
 	public static function getOpsAfter($esId, $seq){
-		$query = \OCP\DB::prepare('SELECT `seq` FROM `*PREFIX*office_op`  WHERE `es_id`=? AND `seq`>? ORDER BY `seq` ASC');
-		$result = $query->execute(array(
-				$esId, $seq
-			))
-			->fetchAll()	
-		;
-		return $result;
+		if ($seq == "") $seq = -1;
+		$oplist = [];
+		$query = \OCP\DB::prepare('SELECT `opspec` FROM `*PREFIX*office_op`  WHERE `es_id`=? AND `seq`>? ORDER BY `seq` ASC');
+		$result = $query->execute(array($esId, $seq));
+		while( $row = $result->fetchRow() ) {
+			$oplist[] = json_decode($row['opspec']);
+		}
+		return $oplist;
 	}
 
 }