What is this error? I am trying to connect from PHP to Traffic Live mysql and do a POST and at some id's I get this error. With the biggest part of contacts my code works just fine but it keeps getting this trouble maker. What can I do?

Here is the trouble making code:if ($sales_datemodified[$h] > $traffic_datemodified[$t]) { //if ($traffic_id[$t] != 22033) { $postrequestclient = $clients -> post("staff/employee", null, '{"@class": "com.sohnar.trafficlite.transfer.trafficcompany.TrafficEmployeeTO", "id": ' . $traffic_id[$t] . ',"locationId":' . $traffic_locationid[$t] . ', "departmentId": ' . $traffic_departmentid[$t] . ', "ownerCompanyId": ' . $traffic_ownercompanyid[$t] . ',"userId": ' . $traffic_userid[$t] . ',"userName": "' . $traffic_username[$t] . '","employeeDetails": {"id": ' . $traffic_id[$t] . ',"jobTitle": "' . $sales_title[$h] . '","costPerHour": { "amountString": ' . $traffic_amountString[$t] . ', "currencyType": "' . $traffic_currencyType[$t] . '"},"hoursWorkedPerDayMinutes": ' . $traffic_hwpdm[$t] . ', "personalDetails": {"id": ' . $traffic_persdetId[$t] . ', "firstName": "' . $sales_firstname[$h] . '","middleName": "' . $traffic_middleName[$t] . '","lastName": "' . $sales_lastname[$h] . '", "emailAddress": "' . $traffic_username[$t] . '","workPhone": "' . $sales_phone[$h] . '","mobilePhone": "' . $sales_mobilephone[$h] . '" }}}') -> setAuth(user, password); $postresponseclient = $postrequestclient -> send() -> json(); I don't have any errors in my code. That commented "if" is for excluding the trouble making contact on which I get this error. If I uncomment that the program runs fine without any problems. The problem is that this test is made on a small number of contacts and if I add more contacts to the test I get more errors of this kind. this should be a synchronization job so excluding all the "bad" contacts won't work