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+---
+title: "Plume"
+description: "Plume"
+date: 2022-12-22
+dateCreated: 2022-12-22
+weight: 11
+extra:
+  parent: 'operations/debogage.md'
+---
+
+## 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
+```