problem with mysql accounting

[basile]

hi
i try to account with mysql
here are the mysql start stop and update definition

accounting_start_query = "INSERT into radaact SET\
                `User-Name` = '%{User-Name}',\
                `Calling-Station-Id` = '%{Calling-Station-Id}',\
                `Called-Station-Id` = '%{Called-Station-Id}',\
                `NAS-IP-Address` = '%{NAS-IP-Address}',\
                `NAS-Port` = %{NAS-Port},\
                `Timestamp Start` = NOW(),\
                `Acct-Unique-Session-Id` = '%{Acct-Unique-Session-Id}'
        "

        accounting_update_query = "UPDATE radaact SET\
                `Acct-Session-Time` = '%{Acct-Session-Time}',\
                `Acct-Input-Octets` = '%{Acct-Input-Octets}',\
                `Acct-Output-Octets` = '%{Acct-Output-Octets}',\
                `Acct-Input-Packets` = '%{Acct-Input-Packets}',\
                `Acct-Output-Packets` = '%{Acct-Output-Packets}'\
        WHERE `Acct-Unique-Session-Id` = '%{Acct-Unique-Session-Id}'\
        LIMIT 1
        "

        accounting_stop_query = "UPDATE radaact SET\
                `Timestamp Stop` = NOW(),\
                `Acct-Session-Time` = '%{Acct-Session-Time}',\
                `Acct-Input-Octets` = '%{Acct-Input-Octets}',\
                `Acct-Output-Octets` = '%{Acct-Output-Octets}',\
                `Acct-Input-Packets` = '%{Acct-Input-Packets}',\
                `Acct-Output-Packets` = '%{Acct-Output-Packets}',\
                `Acct-Terminate-Cause` = '%{Acct-Terminate-Cause}'\
        WHERE `Acct-Unique-Session-Id` = '%{Acct-Unique-Session-Id}'\
        LIMIT 1
        "

update works fine

rlm_sql (sql): sql_set_user escaped user --> 'xxxx'
radius_xlat:  'UPDATE radaact SET??`Acct-Session-Time` =
'292',??`Acct-Input-Octets` = '94237',??`Acct-Output-Octets` =
'937628',??`Acct-Input-Packets` = '597',??`Acct-Output-Packets` =
'816'?WHERE `Acct-Unique-Session-Id` = '814b38bc0e9c60f4'?LIMIT 1 '
rlm_sql (sql): Reserving sql socket id: 2
radius_xlat:  ''
rlm_sql (sql): Released sql socket id: 2
  modcall[accounting]: module "sql" returns ok for request 61
modcall: leaving group accounting (returns ok) for request 61

but start and stop not

rlm_sql (sql): sql_set_user escaped user --> 'yyyy'
radius_xlat:  'INSERT into radaact SET  '
rlm_sql (sql): Reserving sql socket id: 4
rlm_sql_mysql: MYSQL check_error: 1064 received
rlm_sql (sql): Couldn't insert SQL accounting START record - You have an
error in your SQL syntax; check the manual that corresponds to your
MySQL server version for the right syntax to use near '' at line 1
radius_xlat:  ''
rlm_sql (sql): Released sql socket id: 4
  modcall[accounting]: module "sql" returns ok for request 59
modcall: leaving group accounting (returns ok) for request 59


rlm_sql (sql): sql_set_user escaped user --> 'yyyy'
radius_xlat:  'UPDATE radaact SET  '
rlm_sql (sql): Reserving sql socket id: 3
rlm_sql_mysql: MYSQL check_error: 1064 received
rlm_sql (sql): Couldn't update SQL accounting STOP record - You have an
error in your SQL syntax; check the manual that corresponds to your
MySQL server version for the right syntax to use near '' at line 1
rlm_sql (sql): Released sql socket id: 3
  modcall[accounting]: module "sql" returns fail for request 60
modcall: leaving group accounting (returns fail) for request 60

i use mysql 4.1 , freeradius 1.1

thanks for help
basile