I just logged on to my ACP and tried to set a high value (99999999999999999999..) for

Maximum number of allowed recipients per private message:
The maximum number of allowed recipients in a private message. If 0 is entered, the board-wide setting is used.

in User and Groups -> Groups -> Manage Groups -> Administrator

It gave me this error =
Warning: error_log() [function.error-log]: Filename cannot be empty in /home/xxxxx/public_html/includes/functions.php on line 3467

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General Error
SQL ERROR [ mysqli ]

Out of range value adjusted for column 'group_max_recipients' at row 1 [1264]

SQL

UPDATE nsbase_groups SET group_name = 'ADMINISTRATORS', group_desc = 'NS', group_desc_uid = '', group_desc_bitfield = '', group_type = 3, group_desc_options = 7, group_max_recipients = 9999999999 WHERE group_id = 5

BACKTRACE

FILE: includes/db/mysqli.php
LINE: 163
CALL: dbal->sql_error()

FILE: includes/functions_user.php
LINE: 2587
CALL: dbal_mysqli->sql_query()

FILE: includes/acp/acp_groups.php
LINE: 433
CALL: group_create()

FILE: includes/functions_module.php
LINE: 507
CALL: acp_groups->main()

FILE: adm/index.php
LINE: 78
CALL: p_master->load_active()

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Hope it will be fixed