diff --git a/api/src/Mail.php b/api/src/Mail.php
index cee470c3aa..0f23660050 100644
--- a/api/src/Mail.php
+++ b/api/src/Mail.php
@@ -3067,7 +3067,7 @@ class Mail
 				$folders = $this->icServer->getMailboxes($path, $_search, true);
 			}
 
-			uasort($folders,array($this,'sortByMailbox'));//ksort($folders);
+			if (is_array($folders)) uasort($folders, array($this,'sortByMailbox'));
 		}
 		elseif(!$_nodePath) // all
 		{
@@ -3088,7 +3088,7 @@ class Mail
 			if (self::$debugTimes) $starttime = microtime (true);
 			// Merge of all auto folders and specialusefolders
 			$autoFoldersTmp = array_unique((array_merge(self::$autoFolders, array_values(self::$specialUseFolders))));
-			uasort($folders,array($this,'sortByMailbox'));//ksort($folders);
+			if (is_array($folders)) uasort($folders,array($this,'sortByMailbox'));//ksort($folders);
 			$tmpFolders = $folders;
 			$inboxFolderObject=$inboxSubFolderObjects=$autoFolderObjects=$typeFolderObject=$mySpecialUseFolders=array();
 			$googleMailFolderObject=$googleAutoFolderObjects=$googleSubFolderObjects=array();