Cannot use $wpdb insert if remove Custom Field in /edit.php?post_type=meta-box

Hi, my php is limited, i just notice that if i delele Custom Field Group with enabled MB Custom Table in wp-admin/edit.php?post_type=meta-box

i will cannot use $wpdb->insert to that Custom table wp_test.

$table = $wpdb->prefix.'test';
        $data_all = array( 'tk_owner' => $user_id,
                        'tk_name' => $tk_name,
                        'tk_email' => $tk_email,
                        'tk_mobile' => $tk_mobile,
                        'tk_address' => $tk_address,
                        'tk_others' => $tk_others,
                        'tk_family' => $tk_family,
                        'tk_family_mobile' => $tk_family_mobile,
                    );
        $format = array('%s','%s');
        $wpdb->insert($table,$data_all,$format);

If array below 4, wpdb->insert will works:

        $data_all = array( 'tk_owner' => $user_id,
                        'tk_name' => $tk_name,
                        'tk_email' => $tk_email,
                        'tk_mobile' => $tk_mobile,
                    );

I already generated and added PHP Code to theme functions.php for that custom field group from Metabox

Any idea why this wpdb->insert cannot insert new row ??
thanks