diff --git a/lib/private/Files/SetupManager.php b/lib/private/Files/SetupManager.php
index 731692bfda4..8e6caaa3dcb 100644
--- a/lib/private/Files/SetupManager.php
+++ b/lib/private/Files/SetupManager.php
@@ -287,7 +287,7 @@ class SetupManager {
 		$mounts = array_filter($mounts, function (IMountPoint $mount) use ($previouslySetupProviders) {
 			return !in_array($mount->getMountProvider(), $previouslySetupProviders);
 		});
-		$this->userMountCache->registerMounts($user, $mounts, $newProviders);
+		$this->registerMounts($user, $mounts, $newProviders);
 
 		$cacheDuration = $this->config->getSystemValueInt('fs_mount_cache_duration', 5 * 60);
 		if ($cacheDuration > 0) {
@@ -452,7 +452,7 @@ class SetupManager {
 		}
 
 		if (count($mounts)) {
-			$this->userMountCache->registerMounts($user, $mounts, $currentProviders);
+			$this->registerMounts($user, $mounts, $currentProviders);
 			$this->setupForUserWith($user, function () use ($mounts) {
 				array_walk($mounts, [$this->mountManager, 'addMount']);
 			});
@@ -523,7 +523,7 @@ class SetupManager {
 			$mounts = $this->mountProviderCollection->getUserMountsForProviderClasses($user, $providers);
 		}
 
-		$this->userMountCache->registerMounts($user, $mounts, $providers);
+		$this->registerMounts($user, $mounts, $providers);
 		$this->setupForUserWith($user, function () use ($mounts) {
 			array_walk($mounts, [$this->mountManager, 'addMount']);
 		});
@@ -595,4 +595,10 @@ class SetupManager {
 			});
 		}
 	}
+
+	private function registerMounts(IUser $user, array $mounts, ?array $mountProviderClasses = null): void {
+		if ($this->lockdownManager->canAccessFilesystem()) {
+			$this->userMountCache->registerMounts($user, $mounts, $mountProviderClasses);
+		}
+	}
 }