Why am getting error when i think it should work fine

Error

Fatal error: Wrong SQL: INSERT INTO kladilnica (Username, Bet, Win, reg_date, Odds, isActive, ticket_id, isShared, is_winned, Location) VALUES ('Stefan', 100, 3500, '2017-02-06', 66, 1, 351358728, 0, 0, '') Error: in C:\xampp\htdocs\bootstrap\navigation.php on line 257

Code

$sql = "INSERT INTO kladilnica (Username, Bet, Win, reg_date, Odds, isActive, ticket_id, isShared, is_winned, Location) VALUES ('".$user."', ".$bet.", ".$gain.", '".$date."', ".$odds.", 1, $randomTicketID, 0, 0, '".$userLocation."')";
$result = $conn->query($sql);
$TicketID = $conn->insert_id;
trigger_error('Wrong SQL: ' . $sql . ' Error: ' . $conn->error, E_USER_ERROR);

Here is the full script

if(isset($_POST['bet']) && isset($_POST['gain']) && isset($_POST['odds']) && isset($_POST['date'])) {
    $bet = htmlentities($_POST['bet']);
    $gain = htmlentities($_POST['gain']);
    $odds = htmlentities($_POST['odds']);
    $date = htmlentities($_POST['date']);

    $user = getUserData('users', 'UserUsername');
    $userLocation = getUserData('users', 'Location');

    $randomTicketID = mt_rand(000000000,999999999);
    $sql = "INSERT INTO kladilnica (Username, Bet, Win, reg_date, Odds, isActive, ticket_id, isShared, is_winned, Location) VALUES ('".$user."', ".$bet.", ".$gain.", '".$date."', ".$odds.", 1, $randomTicketID, 0, 0, '".$userLocation."')";
    $result = $conn->query($sql);
    $TicketID = $conn->insert_id;
    trigger_error('Wrong SQL: ' . $sql . ' Error: ' . $conn->error, E_USER_ERROR);

    $matches1 = $_POST['match1'];
    $matches2 = $_POST['match2'];
    $tips = $_POST['tip'];
    $countMatches = count($matches1);

    for($i=0; $i < $countMatches; $i++) {
        $match1 = mysqli_real_escape_string($conn, $matches1[$i]);
        $match2 = mysqli_real_escape_string($conn, $matches2[$i]);
        $tip    = $conn->real_escape_string($tips[$i]);

        if ($match1 != "" && $match2 != "" && $tip != "") {
            $match1 = $match1;
            $match2 = $match2;

            $sql2 = "INSERT INTO matches (MatchTitle, Tip, TicketID) VALUES ('".$match1." - ".$match2."', '".$tip."', ".$TicketID.")";
            $result2 = $conn->query($sql2);
        }
    }
}

This line will raise an error and kill the execution:

trigger_error('Wrong SQL: ' . $sql . ' Error: ' . $conn->error, E_USER_ERROR);

If you want to use it, then you have to create a condition, something like this:

if( ! $result)
    trigger_error('Wrong SQL: ' . $sql . ' Error: ' . $conn->error, E_USER_ERROR);

Otherwise it will run at each execution.

Thank you cereal but why the second SQL INSERT doesnt work ? That should insert into database also but can't ? o_0

Dunno, add an error check and see what you get:

if( ! $result2)
    print sprintf('Error (%s) %s', $conn->errno, $conn->error);

Note - on lines 22/23 you are accessing mysqli through procedural mode, instead of OOP, this should not make difference in the code execution, but keep it in consideration.