diff --git a/lib/Interfaces/Object/DocumentInterface.php b/lib/Interfaces/Object/DocumentInterface.php
index 863ac8fe..b0e6efc5 100644
--- a/lib/Interfaces/Object/DocumentInterface.php
+++ b/lib/Interfaces/Object/DocumentInterface.php
@@ -101,7 +101,7 @@ class DocumentInterface implements IActivityPubInterface {
 	 */
 	public function save(ACore $item) {
 		/** @var Document $item */
-		if ($item->getParent()) {
+		if (!$item->isRoot()) {
 			$item->setParentId(
 				$item->getParent()
 					 ->getId()
diff --git a/lib/Service/CurlService.php b/lib/Service/CurlService.php
index 376283e8..514a5a11 100644
--- a/lib/Service/CurlService.php
+++ b/lib/Service/CurlService.php
@@ -103,7 +103,7 @@ class CurlService {
 
 		// we consider an account is like an email
 		if (!filter_var($account, FILTER_VALIDATE_EMAIL)) {
-			throw new InvalidResourceException();
+			throw new InvalidResourceException('account format is not valid');
 		}
 
 		list($username, $host) = explode('@', $account);