diff --git a/lib/private/share/share.php b/lib/private/share/share.php
index 70ed26c0b2..6ad36d60fe 100644
--- a/lib/private/share/share.php
+++ b/lib/private/share/share.php
@@ -765,7 +765,7 @@ class Share extends Constants {
 				}
 
 				// Generate hash of password - same method as user passwords
-				if (!empty($shareWith)) {
+				if (is_string($shareWith) && $shareWith !== '') {
 					self::verifyPassword($shareWith);
 					$shareWith = \OC::$server->getHasher()->hash($shareWith);
 				} else {