When a booking is made via an availability search,

in url http://localhost/checkout/5, i fill "billing information" and pick the button i get this error

PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'revision_id' cannot be null: INSERT INTO {commerce_customer_profile} (revision_id, type, uid, status, created, changed) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5); Array ( [:db_insert_placeholder_0] => [:db_insert_placeholder_1] => billing [:db_insert_placeholder_2] => 1 [:db_insert_placeholder_3] => 1 [:db_insert_placeholder_4] => 1366804825 [:db_insert_placeholder_5] => 1366804825 ) en drupal_write_record() (línea 7036 de C:\Users\JULIAN\Desktop\drupal\acer\xampp-win32-1.7.3\xampp\htdocs\includes\common.inc).