diff --git a/app/docker-compose.yml b/app/docker-compose.yml
index cfd06b2..47f74cc 100644
--- a/app/docker-compose.yml
+++ b/app/docker-compose.yml
@@ -82,8 +82,8 @@ services:
     build:
       context: ./plume/build/plume
       args:
-        VERSION: 57a54cf016cdf566fe45c081bda1971f176c4532
-    image: superboum/plume:v7
+        VERSION: 8709f6cf9f8ff7e3c5ee7ea699ee7c778e92fefc
+    image: superboum/plume:v8
 
   postfix:
     build:
@@ -106,7 +106,3 @@ services:
       context: ./backup/build/backup-consul
     image: lxpz/backup_consul:12
 
-  backup-matrix:
-    build:
-      context: ./backup/build/backup-matrix
-    image: superboum/backup_matrix:4
diff --git a/app/plume/config/app.env b/app/plume/config/app.env
index 3dbf609..0d30ba9 100644
--- a/app/plume/config/app.env
+++ b/app/plume/config/app.env
@@ -29,4 +29,4 @@ LDAP_USER_MAIL_ATTR=mail
 LDAP_TLS=false
 
 RUST_BACKTRACE=1
-RUST_LOG=info
+RUST_LOG=trace
diff --git a/app/plume/deploy/plume.hcl b/app/plume/deploy/plume.hcl
index 14f460e..266a665 100644
--- a/app/plume/deploy/plume.hcl
+++ b/app/plume/deploy/plume.hcl
@@ -23,7 +23,7 @@ job "plume-blog" {
 
       driver = "docker"
       config {
-        image = "superboum/plume:v7"
+        image = "superboum/plume:v8"
         network_mode = "host"
         ports = [ "web_port" ]
         #command = "cat"
diff --git a/op_guide/plume/README.md b/op_guide/plume/README.md
index 4a8bbac..16f7af9 100644
--- a/op_guide/plume/README.md
+++ b/op_guide/plume/README.md
@@ -17,4 +17,28 @@ plm users new \
 ```
 
 That's all folks, now you can use your new account at https://plume.deuxfleurs.fr
- 
+
+## 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
+```