diff --git a/lib/Service/CardService.php b/lib/Service/CardService.php
index 71d578bf0..791849a24 100644
--- a/lib/Service/CardService.php
+++ b/lib/Service/CardService.php
@@ -267,7 +267,7 @@ public function delete($id) {
 	public function update($id, $title, $stackId, $type, $owner, $description = '', $order = 0, $duedate = null, $deletedAt = null, $archived = null) {
 		$this->cardServiceValidator->check(compact('id', 'title', 'stackId', 'type', 'owner', 'order'));
 
-		$this->permissionService->checkPermission($this->cardMapper, $id, Acl::PERMISSION_EDIT, allowDeletedCard: true);
+		$this->permissionService->checkPermission($this->cardMapper, $id, Acl::PERMISSION_EDIT, null, true);
 		$this->permissionService->checkPermission($this->stackMapper, $stackId, Acl::PERMISSION_EDIT);
 
 		if ($this->boardService->isArchived($this->cardMapper, $id)) {
diff --git a/lib/Service/CommentService.php b/lib/Service/CommentService.php
index c37b8cff2..34fe2ab25 100644
--- a/lib/Service/CommentService.php
+++ b/lib/Service/CommentService.php
@@ -77,10 +77,6 @@ public function list(string $cardId, int $limit = 20, int $offset = 0): DataResp
 	}
 
 	/**
-	 * @param string $cardId
-	 * @param string $message
-	 * @param string $replyTo
-	 * @return DataResponse
 	 * @throws BadRequestException
 	 * @throws NotFoundException|NoPermissionException
 	 */
@@ -136,7 +132,7 @@ public function update(string $cardId, string $commentId, string $message): Data
 			throw new NoPermissionException('Only authors are allowed to edit their comment.');
 		}
 		if ($comment->getParentId() !== '0') {
-			$this->permissionService->checkPermission($this->cardMapper, $comment->getParentId(), Acl::PERMISSION_READ);
+			$this->permissionService->checkPermission($this->cardMapper, (int)$comment->getParentId(), Acl::PERMISSION_READ);
 		}
 
 		$comment->setMessage($message);
diff --git a/lib/Service/PermissionService.php b/lib/Service/PermissionService.php
index 2f423d4c6..bddf3e710 100644
--- a/lib/Service/PermissionService.php
+++ b/lib/Service/PermissionService.php
@@ -98,7 +98,11 @@ public function __construct(
 	 * @param $boardId
 	 * @return bool|array
 	 */
-	public function getPermissions($boardId) {
+	public function getPermissions($boardId, ?string $userId = null) {
+		if ($userId === null) {
+			$userId = $this->userId;
+		}
+
 		if ($cached = $this->permissionCache->get($boardId)) {
 			return $cached;
 		}
@@ -113,7 +117,7 @@ public function getPermissions($boardId) {
 			Acl::PERMISSION_SHARE => ($owner || $this->userCan($acls, Acl::PERMISSION_SHARE))
 				&& (!$this->shareManager->sharingDisabledForUser($this->userId))
 		];
-		$this->permissionCache->set($boardId, $permissions);
+		$this->permissionCache->set((string)$boardId, $permissions);
 		return $permissions;
 	}
 
@@ -169,7 +173,7 @@ public function checkPermission($mapper, $id, $permission, $userId = null, bool
 		}
 
 		try {
-			$acls = $this->getBoard($boardId)->getAcl() ?? [];
+			$acls = $this->getBoard((int)$boardId)->getAcl() ?? [];
 			$result = $this->userCan($acls, $permission, $userId);
 			if ($result) {
 				return true;