# Error upgrading to latest Discourse -- solved

**URL:** <https://meta.discourse.org/t/error-upgrading-to-latest-discourse-solved/362519>\
**Category:** Product Support\
**Tags:** solved\
**Created:** [April 18, 2025, 3:22pm UTC](https://meta.discourse.org/t/error-upgrading-to-latest-discourse-solved/362519 "2025-04-18T15:22:13Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![Alexander\_Wright](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/alexander_wright/32/119518_2.png) [@Alexander\_Wright](https://meta.discourse.org/u/Alexander_Wright)\
**Post date:** [April 18, 2025, 3:22pm UTC](https://meta.discourse.org/t/error-upgrading-to-latest-discourse-solved/362519/1 "2025-04-18T15:22:13Z")

</div>

I’ve just received an error with my Discourse installation when attempting to upgrade to 3.5.0.beta3-dev:

Discourse fails to start. Any suggestions are greatly appreciated.

```plaintext
Status: Image is up to date for discourse/base:2.0.20250226-0128

...

I, [2025-04-18T15:16:34.677745 #1] INFO -- : > cd /var/www/discourse && su discourse -c 'LOAD_PLUGINS=0 bundle exec rake plugin:pull_compatible_all'
I, [2025-04-18T15:16:40.775977 #1] INFO -- : discourse-bbcode-color is already at latest compatible version
discourse-cakeday is already at latest compatible version
discourse-chat-integration is already at latest compatible version
discourse-data-explorer is already at latest compatible version
discourse-math is already at latest compatible version
discourse-oauth2-basic is already at latest compatible version
discourse-rss-polling is already at latest compatible version
discourse-solved is already at latest compatible version
discourse-whos-online is already at latest compatible version
discourse-yearly-review is already at latest compatible version
docker_manager is already at latest compatible version

```

Error:

```plaintext
I, [2025-04-18T15:16:50.782650 #1] INFO -- : > cd /var/www/discourse && su discourse -c 'bundle exec rake db:migrate'
2025-04-18 15:16:59.705 UTC [911] discourse@discourse ERROR: null value in column "answer_post_id" of relation "discourse_solved_solved_topics" violates not-null constraint
2025-04-18 15:16:59.705 UTC [911] discourse@discourse DETAIL: Failing row contains (768, 16673, null, -1, null, 2021-05-10 18:32:53.008822, 2021-05-10 18:32:53.008822).
2025-04-18 15:16:59.705 UTC [911] discourse@discourse STATEMENT: INSERT INTO discourse_solved_solved_topics (
          topic_id,
          answer_post_id,
          topic_timer_id,
          accepter_user_id,
          created_at,
          updated_at
        )
        SELECT
          tc.topic_id,
          tc.answer_post_id,
          tc.topic_timer_id,
          tc.accepter_user_id,
          tc.created_at,
          tc.updated_at
        FROM (
          SELECT
            tc.topic_id,
            CAST(tc.value AS INTEGER) AS answer_post_id,
            CAST(tc2.value AS INTEGER) AS topic_timer_id,
            COALESCE(ua.acting_user_id, -1) AS accepter_user_id,
            tc.created_at,
            tc.updated_at,
            ROW_NUMBER() OVER (PARTITION BY tc.topic_id ORDER BY tc.created_at ASC) AS rn_topic,
            ROW_NUMBER() OVER (PARTITION BY CAST(tc.value AS INTEGER) ORDER BY tc.created_at ASC) AS rn_answer
          FROM topic_custom_fields tc
          LEFT JOIN topic_custom_fields tc2 ON tc2.topic_id = tc.topic_id AND tc2.name = 'solved_auto_close_topic_timer_id'
          LEFT JOIN user_actions ua ON ua.target_topic_id = tc.topic_id AND ua.action_type = 15
          WHERE tc.name = 'accepted_answer_post_id'
            AND tc.id > 0
            AND tc.id <= 0 + 10000
        ) tc
        WHERE tc.rn_topic = 1 AND tc.rn_answer = 1
        ON CONFLICT DO NOTHING

rake aborted!
StandardError: An error has occurred, all later migrations canceled: (StandardError)

```

---

_[View the full topic](https://meta.discourse.org/t/error-upgrading-to-latest-discourse-solved/362519)._