diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php
index 9a9498511..0f54b8f7d 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/Commands/Messages.php
@@ -289,7 +289,7 @@ trait Messages
 			$this->FolderSelect($sFolderName);
 			$iNewUid = $this->MessageAppendStream($sFolderName, $rMessageStream, $iStreamSize, $aFlagsList, $iDateTime);
 			if ($iUid) {
-				$oRange = new SequenceSet([$iUid]);
+				$oRange = new SequenceSet($iUid);
 				$this->MessageStoreFlag($oRange,
 					array(MessageFlag::DELETED),
 					StoreAction::ADD_FLAGS_SILENT
diff --git a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/SequenceSet.php b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/SequenceSet.php
index d5ac526ac..e8f742980 100644
--- a/snappymail/v/0.0.0/app/libraries/MailSo/Imap/SequenceSet.php
+++ b/snappymail/v/0.0.0/app/libraries/MailSo/Imap/SequenceSet.php
@@ -28,6 +28,9 @@ class SequenceSet /*extends \SplFixedArray*/ implements \Countable
 
 	private array $data = [];
 
+	/**
+	 * @param mixed $mItems Can be array, string or int
+	 */
 	public function __construct($mItems, bool $uid = true)
 	{
 		if (\is_array($mItems)) {
diff --git a/snappymail/v/0.0.0/app/libraries/snappymail/imap/sync.php b/snappymail/v/0.0.0/app/libraries/snappymail/imap/sync.php
index d4d0043ba..38d5e8172 100644
--- a/snappymail/v/0.0.0/app/libraries/snappymail/imap/sync.php
+++ b/snappymail/v/0.0.0/app/libraries/snappymail/imap/sync.php
@@ -198,7 +198,7 @@ class Sync
 							);
 							if ($iAppendUid && $aFlags) {
 								$this->MessageStoreFlag(
-									new SequenceSet([$iAppendUid]),
+									new SequenceSet($iAppendUid),
 									$aFlags,
 									\MailSo\Imap\Enumerations\StoreAction::ADD_FLAGS_SILENT
 								);