diff --git a/tools/av-generate-insights.php b/tools/av-generate-insights.php
index 555d696..1af97ee 100644
--- a/tools/av-generate-insights.php
+++ b/tools/av-generate-insights.php
@@ -254,11 +254,18 @@ function av_ensure_insight_single_template() {
         ]);
     }
 
-    // Mark as type=single + apply to all single posts
+    // Mark as type=single + apply to all single posts.
+    // Bricks expects main='postType' + postType=['post'] (array) — not the
+    // 'singular' + 'object' variant. Using the wrong format triggers
+    // 'Invalid post type' when opening the template in the builder.
     update_post_meta($tpl_id, '_bricks_template_type', 'single');
     $settings = get_post_meta($tpl_id, '_bricks_template_settings', true) ?: [];
     $settings['templateConditions'] = [
-        ['id' => substr(md5('postSingle'), 0, 6), 'main' => 'singular', 'object' => 'post'],
+        [
+            'id'       => substr(md5('postSingle'), 0, 6),
+            'main'     => 'postType',
+            'postType' => ['post'],
+        ],
     ];
     update_post_meta($tpl_id, '_bricks_template_settings', $settings);