diff --git a/runbot/migrations/17.0.5.8/post-migration.py b/runbot/migrations/17.0.5.8/post-migration.py
index 3dc783af..dea6d62a 100644
--- a/runbot/migrations/17.0.5.8/post-migration.py
+++ b/runbot/migrations/17.0.5.8/post-migration.py
@@ -5,6 +5,11 @@ _logger = logging.getLogger(__name__)
 
 def migrate(cr, version):
 
+    #cr.execute('CREATE SEQUENCE runbot_build_error_id_seq')
+    # update sequence
+    cr.execute("SELECT setval('runbot_build_error_id_seq',  (SELECT MAX(id) FROM runbot_build_error))")
+    cr.execute("ALTER TABLE runbot_build_error ALTER COLUMN id SET DEFAULT nextval('runbot_build_error_id_seq')")
+
     # get seen infos
     cr.execute("SELECT error_content_id, min(build_id), min(log_date), max(build_id), max(log_date), count(DISTINCT build_id) FROM runbot_build_error_link GROUP BY error_content_id")
     vals_by_error = {error: vals for error, *vals in cr.fetchall()}
diff --git a/runbot/migrations/17.0.5.8/pre-migration.py b/runbot/migrations/17.0.5.8/pre-migration.py
index fb550ef4..1b6bf034 100644
--- a/runbot/migrations/17.0.5.8/pre-migration.py
+++ b/runbot/migrations/17.0.5.8/pre-migration.py
@@ -1,4 +1,7 @@
 def migrate(cr, version):
     cr.execute('ALTER TABLE runbot_build_error RENAME TO runbot_build_error_content')
+    cr.execute('CREATE SEQUENCE runbot_build_error_content_id_seq')
+    cr.execute("SELECT setval('runbot_build_error_content_id_seq',  (SELECT MAX(id) FROM runbot_build_error_content))")
+    cr.execute("ALTER TABLE runbot_build_error_content ALTER COLUMN id SET DEFAULT nextval('runbot_build_error_content_id_seq')")
     cr.execute('ALTER TABLE runbot_build_error_content ADD COLUMN first_seen_build_id INT')
     cr.execute('ALTER TABLE runbot_build_error_link RENAME COLUMN build_error_id TO error_content_id')
diff --git a/runbot/models/build_error.py b/runbot/models/build_error.py
index c8c68146..02d0de49 100644
--- a/runbot/models/build_error.py
+++ b/runbot/models/build_error.py
@@ -70,9 +70,11 @@ def _compute_related_error_content_ids(field_name):
 
 class BuildError(models.Model):
     _name = "runbot.build.error"
-    _description = "An object to manage a group of errors log that fit together and assign them to a team"
+    _description = "Build error"
+    # An object to manage a group of errors log that fit together and assign them to a team
     _inherit = ('mail.thread', 'mail.activity.mixin', 'runbot.build.error.seen.mixin')
 
+
     name = fields.Char("Name")
     active = fields.Boolean('Open (not fixed)', default=True, tracking=True)
     description = fields.Text("Description", store=True, compute='_compute_description')
@@ -320,7 +322,7 @@ class BuildError(models.Model):
 class BuildErrorContent(models.Model):
 
     _name = 'runbot.build.error.content'
-    _description = "Build error log"
+    _description = "Build error content"
 
     _inherit = ('mail.thread', 'mail.activity.mixin', 'runbot.build.error.seen.mixin')
     _rec_name = "id"
@@ -360,9 +362,10 @@ class BuildErrorContent(models.Model):
                 previous_error_content = error_content.search([
                     ('fingerprint', '=', error_content.fingerprint),
                     ('error_id.active', '=', False),
+                    ('error_id.id', '!=', error_content.error_id.id or False),
                     ('id', '!=', error_content.id or False),
-                ])
-                if previous_error_content and previous_error_content != error_content.error_id:
+                ], order="id desc", limit=1)
+                if previous_error_content:
                     error_content.error_id.message_post(body=f"An historical error was found for error {error_content.id}: {previous_error_content.id}")
                     error_content.error_id.previous_error_id = previous_error_content.error_id