diff --git a/app/ui/groups/table.tsx b/app/ui/groups/table.tsx
index 253c271..93e6d4b 100644
--- a/app/ui/groups/table.tsx
+++ b/app/ui/groups/table.tsx
@@ -35,6 +35,7 @@ export default function GroupsTable({ groups, onUpdate, onEdit, onEditAffinities
     return acc;
   }, new Map());
 
+  groups.forEach(group => group.children = []);
   groups.forEach(group => {
     if (group.parentId) {
       const parent = index.get(group.parentId);