diff --git a/apps/files_external/lib/Lib/Storage/SFTP.php b/apps/files_external/lib/Lib/Storage/SFTP.php
index 5f3d02dfd0a..581c473da24 100644
--- a/apps/files_external/lib/Lib/Storage/SFTP.php
+++ b/apps/files_external/lib/Lib/Storage/SFTP.php
@@ -328,6 +328,9 @@ class SFTP extends \OC\Files\Storage\Common {
 	public function filetype($path) {
 		try {
 			$stat = $this->getConnection()->stat($this->absPath($path));
+			if (!is_array($stat) || !array_key_exists('type', $stat)) {
+				return false;
+			}
 			if ((int) $stat['type'] === NET_SFTP_TYPE_REGULAR) {
 				return 'file';
 			}