guide.deuxfleurs.fr/content/operations/debogage/plume.md

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+++
title = "Plume"
description = "Plume"
date = 2022-12-22
dateCreated = 2022-12-22
weight = 11
+++
## Bug and debug
If you can't follow a new user and have this error:
```
2022-04-23T19:26:12.639285Z WARN plume::routes::errors: Db(DatabaseError(UniqueViolation, "duplicate key value violates unique constraint \"follows_unique_ap_url\""))
```
You might have an empty field in your database:
```
plume=> select * from follows where ap_url='';
id | follower_id | following_id | ap_url
------+-------------+--------------+--------
2118 | 20 | 238 |
(1 row)
```
Simply set the `ap_url` as follows:
```
plume=> update follows set ap_url='https://plume.deuxfleurs.fr/follows/2118' where id=2118;
UPDATE 1
```