# Upgrade failing

**URL:** <https://meta.discourse.org/t/upgrade-failing/293464>\
**Category:** Self-hosting\
**Tags:** stable\
**Created:** [January 30, 2024, 12:53pm UTC](https://meta.discourse.org/t/upgrade-failing/293464 "2024-01-30T12:53:44Z")\
**Posts on this page:** 1\
**Showing post:** 1

<div class="post-metadata">

**Author:** ![honzao](https://avatars.discourse-cdn.com/v4/letter/h/49beb7/32.png) [@honzao](https://meta.discourse.org/u/honzao)\
**Post date:** [January 30, 2024, 12:53pm UTC](https://meta.discourse.org/t/upgrade-failing/293464/1 "2024-01-30T12:53:44Z")

</div>

Hi,  
I am testing Discourse upgrade from version 3.0.3 to 3.0.4. After the upgrade Discourse is running, but after login to the system most of the pages/requests end up with 500 error.  
In log files I see two different errors:

```plaintext
Job exception: PG::SyntaxError: ERROR: zero-length delimited identifier at or near """" LINE 1: ...1003061, "success" = TRUE WHERE "scheduler_stats"."" IS NULL
rack-mini-profiler-3.1.0/lib/patches/db/pg.rb:69:in `exec_params' rack-mini-profiler-3.1.0/lib/patches/db/pg.rb:69:in `exec_params' activerecord-7.0.5.1/lib/active_record/connection_adapters/postgresql_adapter.rb:768:in `block (2 levels) in exec_no_cache' activesupport-

```

and

```plaintext
NoMethodError (undefined method `keys' for nil:NilClass) (eval):76:in `_fast_attributes' app/controllers/application_controller.rb:650:in `preload_current_user_data' app/controllers/application_contro
plugins/chat/lib/chat/channel_fetcher.rb:164:in `preload_custom_fields_for'
plugins/chat/lib/chat/channel_fetcher.rb:159:in `secured_public_channels'
plugins/chat/lib/chat/channel_fetcher.rb:9:in `structured'
plugins/chat/plugin.rb:239:in `block (2 levels) in activate!'
(eval):76:in `_fast_attributes'

```

When I downgrade system back to 3.0.3 everything works fine.

We are not using many plugins, but I also did one attempt with all plugins disabled. Same result.

Thanks in advance for any help.

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