diff --git a/templates/comments_tree_sub.tpl b/templates/comments_tree_sub.tpl
index 4493ace..2d16208 100644
--- a/templates/comments_tree_sub.tpl
+++ b/templates/comments_tree_sub.tpl
@@ -1,6 +1,6 @@
 {foreach from=$subcomments item=c}
     
-    <div class="card mb-3 mod_comment_comment{if $c.parent_id} ms-4{/if}" id="comment_wrapper_{$c.Id}" data-user-rating="{$c.user_rating|default:0}" data-is-own="{if $c.is_my_own}1{else}0{/if}">
+    <div class="card mb-3 mod_comment_comment{if $c.parent_id} ms-4{/if}" id="comment_wrapper_{$c.Id}" data-user-rating="{$c.user_rating|default:0}" data-is-own="{if isset($c.is_my_own) && $c.is_my_own}1{else}0{/if}">
 
     {if isset($smarty.request.subaction) && $smarty.request.subaction=='showonly' && isset($smarty.request.comment_id) && $smarty.request.comment_id==$c.Id}
         <div class="border border-warning border-3 rounded p-0">