CiviEngage - error when printing with total amoun

(truncated version of query to miss identifying fields)

[code] => -1
[message] => DB Error: unknown error
[mode] => 16
[debug_info] => INSERT INTO WalkList_5342f99f20516 SET
name = 'Jim',
phone = 777',
age = 65,
sex = 'Female',
lang = '',
party = 'D',
vh = '',
contact_type = 'Member',
other_name = '0',
contact_id = 7,
total_amount = '',date_received = '' [nativecode=1366 * Incorrect integer value: '' for column 'total_amount' at row 1]
[type] => DB_Error