diff --git a/lib/Versions/ExpireManager.php b/lib/Versions/ExpireManager.php
index 97012e0eb..9f82e42d3 100644
--- a/lib/Versions/ExpireManager.php
+++ b/lib/Versions/ExpireManager.php
@@ -67,7 +67,7 @@ protected function getAutoExpireList(int $time, array $versions): array {
 				if ($nextInterval === -1 || $prevTimestamp > $nextInterval) {
 					if ($version->getTimestamp() > $nextVersion) {
 						// Do not expire versions with a label.
-						if ($version->getMetadataValue('label') === null || $version->getMetadataValue('label') === '') {
+						if (!($version instanceof IMetadataVersion) || $version->getMetadataValue('label') === null || $version->getMetadataValue('label') === '') {
 							//distance between two version too small, mark to delete
 							$toDelete[] = $version;
 						}