diff --git a/ereuse_devicehub/migrations/versions/4b7f77f121bf_add_api_keys_dlt_to_user.py b/ereuse_devicehub/migrations/versions/4b7f77f121bf_add_api_keys_dlt_to_user.py
new file mode 100644
index 00000000..fcbb456e
--- /dev/null
+++ b/ereuse_devicehub/migrations/versions/4b7f77f121bf_add_api_keys_dlt_to_user.py
@@ -0,0 +1,35 @@
+"""add api_keys_dlt to user
+
+Revision ID: 4b7f77f121bf
+Revises: af038a8a388c
+Create Date: 2022-12-01 10:35:36.795035
+
+"""
+import citext
+import sqlalchemy as sa
+from alembic import context, op
+
+# revision identifiers, used by Alembic.
+revision = '4b7f77f121bf'
+down_revision = 'af038a8a388c'
+branch_labels = None
+depends_on = None
+
+
+def get_inv():
+    INV = context.get_x_argument(as_dictionary=True).get('inventory')
+    if not INV:
+        raise ValueError("Inventory value is not specified")
+    return INV
+
+
+def upgrade():
+    op.add_column(
+        'user',
+        sa.Column('api_keys_dlt', type_=citext.CIText(), nullable=True),
+        schema='common',
+    )
+
+
+def downgrade():
+    op.drop_column('user', 'api_keys_dlt', schema='common')
diff --git a/ereuse_devicehub/resources/device/models.py b/ereuse_devicehub/resources/device/models.py
index fe68d3ef..1c98377c 100644
--- a/ereuse_devicehub/resources/device/models.py
+++ b/ereuse_devicehub/resources/device/models.py
@@ -831,15 +831,19 @@ class Device(Thing):
         if 'trublo' not in app.blueprints.keys() or not self.hid:
             return
 
+        if not session.get('token_dlt'):
+            return
+
         chid = hashlib.sha3_256(self.hid.encode('utf-8')).hexdigest()
-        token_dlt = session.get('token_dlt', ".").split(".")[1]
+        token_dlt = session.get('token_dlt').split(".")[1]
         api_dlt = app.config.get('API_DLT')
         if not token_dlt or not api_dlt:
             return
 
         api = API(api_dlt, token_dlt, "ethereum")
 
-        result = api.register_device(chid)
+        api.register_device(chid)
+        # result = api.register_device(chid)
 
     def __lt__(self, other):
         return self.id < other.id
diff --git a/ereuse_devicehub/resources/lot/models.py b/ereuse_devicehub/resources/lot/models.py
index 461e7c69..68eec828 100644
--- a/ereuse_devicehub/resources/lot/models.py
+++ b/ereuse_devicehub/resources/lot/models.py
@@ -51,6 +51,7 @@ class Lot(Thing):
         primaryjoin=lambda: Lot.id == LotParent.child_id,
         secondaryjoin=lambda: LotParent.parent_id == Lot.id,
         cascade='refresh-expire',  # propagate changes outside ORM
+        sync_backref=False,
         backref=db.backref(
             'children',
             viewonly=True,
diff --git a/ereuse_devicehub/resources/user/models.py b/ereuse_devicehub/resources/user/models.py
index 33c77043..e72ca075 100644
--- a/ereuse_devicehub/resources/user/models.py
+++ b/ereuse_devicehub/resources/user/models.py
@@ -105,11 +105,13 @@ class User(UserMixin, Thing):
 
         from modules.trublo.utils import encrypt
 
+        # import pdb; pdb.set_trace()
         api_dlt = app.config.get('API_DLT')
         data = register_user(api_dlt)
+        api_token = data.get('data', {}).get('api_token')
         data = json.dumps(data)
         self.api_keys_dlt = encrypt(password, data)
-        return data.get('data', {}).get('api_token')
+        return api_token
 
     def get_dlt_keys(self, password):
         if 'trublo' not in app.blueprints.keys():
@@ -117,6 +119,8 @@ class User(UserMixin, Thing):
 
         from modules.trublo.utils import decrypt
 
+        # import pdb; pdb.set_trace()
+
         if not self.api_keys_dlt:
             return {}