diff --git a/includes/admin.php b/includes/admin.php
index f4d2140..272c066 100644
--- a/includes/admin.php
+++ b/includes/admin.php
@@ -267,9 +267,11 @@ function wpdocs_admin_classes($classes)
 	global $post;
 
 	$thematique = get_the_terms(get_the_ID(), 'thematiques')[0] ?? null;
+	if (!$thematique) return $classes;
+
 	$thematiqueParent = getParentThematique($thematique);
-	$thematiqueColorSlug = getThematiqueFamilySlug($thematiqueParent->slug) ?? null;
-	$postType = get_post_type($post->ID);
+	$thematiqueColorSlug = getThematiqueFamilySlug($thematiqueParent->slug);
+	$postType = get_post_type($post->ID) ?? null;
 
 	if (in_array($pagenow, array('post.php', 'post-new.php'), true) && $thematiqueColorSlug && ($postType == 'conseils' || $postType == 'questions')) {
 		$classes .= ' ' . $thematiqueParent->slug;