# walt device forget switch-S9
Unexpected server-side issue! update or delete on table "devices" violates foreign key constraint "switches_mac_fkey" on table "switches"
DETAIL: Key (mac)=(6c:b0:ce:18:d5:6c) is still referenced from table "switches".
done.
At the server side, we have this error log:
File "/usr/local/lib/python2.7/dist-packages/walt/server/threads/main/db.py", line 127, in forget_device
""", (dev_name,)*6)
File "/usr/local/lib/python2.7/dist-packages/walt/server/postgres.py", line 45, in execute
self.c.execute(query, query_args)
File "/usr/lib/python2.7/dist-packages/psycopg2/extras.py", line 288, in execute
return super(NamedTupleCursor, self).execute(query, vars)
psycopg2.IntegrityError: update or delete on table "devices" violates foreign key constraint "switches_mac_fkey" on table "switches"
DETAIL: Key (mac)=(6c:b0:ce:18:d5:6c) is still referenced from table "switches".
walt device forget
raises an error:At the server side, we have this error log: