diff --git a/core/backend/Install/LegacyHandler/InstallHandler.php b/core/backend/Install/LegacyHandler/InstallHandler.php
index f83d1e61c..8625a0561 100644
--- a/core/backend/Install/LegacyHandler/InstallHandler.php
+++ b/core/backend/Install/LegacyHandler/InstallHandler.php
@@ -191,7 +191,9 @@ class InstallHandler extends LegacyHandler
         }
         $messages = array_merge($messages, $installMessages);
 
-        $feedback->setSuccess($success)->setMessages($messages);
+        $debug = $installResult['debug'] ?? [];
+
+        $feedback->setSuccess($success)->setMessages($messages)->setDebug($debug);
 
         chdir($this->projectDir);