The problem with auto increment, what could be the problem?

Question

PHP

Hello, when I add an ID to a table and do auto increment on it, then my data stops being written to the database after authorization, what could be the problem?
Here is the code, initially when the table without auto increment everything works fine

$ipcountry = json_decode(file_get_contents("http://www.geoplugin.net/json.gp?ip=".$ip)) -> {'geoplugin_countryName'};
if (empty($ipcountry)) {$ipcountry = 'XX';}
$SQL = $odb -> prepare('INSERT INTO `loginlogs` VALUES(:username, :ip, UNIX_TIMESTAMP(), :ipcountry)');
$SQL -> execute(array(':ip' => $ip, ':username' => $username, ':ipcountry' => $ipcountry));

Answer 1

Everything I did used the null value

$SQL = $odb -> prepare('INSERT INTO `loginlogs` VALUES(NULL, :username, :ip, UNIX_TIMESTAMP(), :ipcountry)');

Answer 2

RTFM php.net/manual/ru/pdo.errorinfo.php