diff --git a/question/format.php b/question/format.php
index abba7a896b1..bcc5c917946 100644
--- a/question/format.php
+++ b/question/format.php
@@ -426,7 +426,7 @@ class qformat_default {
 
             if (!empty($CFG->usetags) && isset($question->tags)) {
                 require_once($CFG->dirroot . '/tag/lib.php');
-                tag_set('question', $question->id, $question->tags, 'core_question', $question->context);
+                tag_set('question', $question->id, $question->tags, 'core_question', $question->context->id);
             }
 
             if (!empty($result->error)) {