Неверное целочисленное значение: "для столбца

I have a problem with a line of sql and php code. I keep getting this error and I'm so confused as to what it is

the problem:

Incorrect integer value: '' for column 'ID' at row 1

the sql code:

CREATE TABLE `attendanceout` (
  `out_ID` int(10) NOT NULL,
  `ID` int(10) NOT NULL,
  `time_out` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  `date_info` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  `Room` varchar(100) COLLATE utf8_unicode_ci NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

ALTER TABLE `attendanceout`
  ADD PRIMARY KEY (`out_ID`);

ALTER TABLE `attendanceout`
  MODIFY `out_ID` int(10) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1;

this is the php script:

$sql = "INSERT INTO attendanceout (out_ID, ID, time_out, date_info, Room)
VALUES ('". $out_id . "', '". $id . "', '" . $time . "', '" . $date. "', '" . $dataSendOut. "')";

I already tried to removed the quote in $out_id and $id but a different error appears. 

this is the error that appears if I remove the quote. "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '"