diff --git a/lib/private/Files/Cache/FailedCache.php b/lib/private/Files/Cache/FailedCache.php
index b57ca2b257..d9315ec50d 100644
--- a/lib/private/Files/Cache/FailedCache.php
+++ b/lib/private/Files/Cache/FailedCache.php
@@ -24,6 +24,7 @@ namespace OC\Files\Cache;
 
 use OCP\Constants;
 use OCP\Files\Cache\ICache;
+use OCP\Files\Cache\ICacheEntry;
 use OCP\Files\Search\ISearchQuery;
 
 /**
@@ -134,4 +135,8 @@ class FailedCache implements ICache {
 	public function normalize($path) {
 		return $path;
 	}
+
+	public function copyFromCache(ICache $sourceCache, ICacheEntry $sourceEntry, string $targetPath): int {
+		throw new \Exception("Invalid cache");
+	}
 }
diff --git a/lib/private/Lockdown/Filesystem/NullCache.php b/lib/private/Lockdown/Filesystem/NullCache.php
index 396bf68d5d..267b76ab8f 100644
--- a/lib/private/Lockdown/Filesystem/NullCache.php
+++ b/lib/private/Lockdown/Filesystem/NullCache.php
@@ -26,6 +26,7 @@ namespace OC\Lockdown\Filesystem;
 use OC\Files\Cache\CacheEntry;
 use OCP\Constants;
 use OCP\Files\Cache\ICache;
+use OCP\Files\Cache\ICacheEntry;
 use OCP\Files\FileInfo;
 use OCP\Files\Search\ISearchQuery;
 
@@ -122,4 +123,8 @@ class NullCache implements ICache {
 	public function normalize($path) {
 		return $path;
 	}
+
+	public function copyFromCache(ICache $sourceCache, ICacheEntry $sourceEntry, string $targetPath): int {
+		throw new \OC\ForbiddenException('This request is not allowed to access the filesystem');
+	}
 }