[Exim] error in mysql delivering and non-printing character …

Hello

i've exim with mysql for user, aliases, autoresponder, forwarder and
lots more.

in different cases i get the error

    Expansion of "${lookup mysql{Select TRIM( arp_subject ) from
autoresponder, user, domain, site where dom_name = trim(
'${quote_mysql:$domain}' ) and dom_sit_aid = sit_aid and sit_aid =
usr_sit_aid and usr_uname = trim( '${quote_mysql:$local_part}' ) and ( (
arp_from = '0000-00-00' or arp_from <= NOW() ) and ( arp_till =
'0000-00-00'
or arp_till >= NOW() ) ) and arp_usr_aid = usr_aid limit 1}}" in
mysql_autoresponder_delivery transport contains non-printing character 252

but i do not know what that means.
is there someone how knows hat that could be?

thanks for help.

regards Karl-Heinz