diff --git a/app/Http/Controllers/RestApi/ApiHelper.php b/app/Http/Controllers/RestApi/ApiHelper.php
index 93a50b5..a841f16 100644
--- a/app/Http/Controllers/RestApi/ApiHelper.php
+++ b/app/Http/Controllers/RestApi/ApiHelper.php
@@ -53,7 +53,7 @@ public static function getMemberAsArray(Member $member, array $allowedGroups, $i
         foreach ($allowedGroups as $group) {
             $rootGroupIds = $member->getFirstLevelGroupIds($group->getId());
             foreach ($rootGroupIds as $id) {
-                $rootGroups = $groupRepo->get($id)->getName();
+                $rootGroups[] = $groupRepo->get($id)->getName();
             }
         }