diff --git a/controllers/customize.php b/controllers/customize.php
index 92e2978..9279ba3 100644
--- a/controllers/customize.php
+++ b/controllers/customize.php
@@ -268,7 +268,7 @@ public function addForum()
             $groupDto->description = $groupDescription;
             $groupDto->order = $forumService->getNewGroupOrder($sectionDto->id);
             $groupDto->isPrivate = (bool) $isPrivate;
-            $groupDto->roles = count($roles) ? json_encode($roles) : null;
+            $groupDto->roles = ($roles !== null) ? json_encode($roles) : null;
 
             $forumService->saveOrUpdateGroup($groupDto);
 
@@ -366,7 +366,7 @@ public function editGroup()
             $groupDto->name = $groupName;
             $groupDto->description = $groupDescription;
             $groupDto->isPrivate = (bool) $isPrivate;
-            $groupDto->roles = count($roles) ? json_encode($roles) : null;
+            $groupDto->roles = ($roles !== null) ? json_encode($roles) : null;
 
             $forumService->saveOrUpdateGroup($groupDto);
 
@@ -564,4 +564,4 @@ private function generateEditGroupForm( $action )
 
         return $form;
     }
-}
\ No newline at end of file
+}