<?php

//DB-varaibles
$dsn = "mysql:dbname=dbirkemalm_com;host=dbirkemalm.com.mysql;";
$username = "dbirkemalm_com";
$password ="8ejxQ4Pn";
$db_name = "dbirkemalm_com";
$vote_table = 'votes';

//Variables
$ip = $_SERVER['REMOTE_ADDR'];
$vote = $_GET['id'];

//Connect to DB
try {
    $dbh = new PDO($dsn, $username, $password);
    }   catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

$dbh->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

//Insert vote and IP
$ipinsql = "INSERT INTO $vote_table (ip, vote) VALUES(:ip, :vote)";
$ipinsq = $dbh->prepare($ipinsql);
$ipinsq->bindParam(':ip', $ip, PDO::PARAM_STR);
$ipinsq->bindParam(':vote', $vote, PDO::PARAM_STR);
$ipinsq->execute();

//Total number of votes

$totalsql = "SELECT * FROM $vote_table";
$totalq = $dbh->prepare($totalsql);
$totalq->execute();
$total = $totalq->rowCount();


//Get number of A-votes
$bar1sql = "SELECT * FROM $vote_table WHERE vote = 'A'";
$bar1q = $dbh->prepare($bar1sql);
$bar1q->execute();
$bar1count = $bar1q->rowCount();

//Get number of B-votes
$bar2sql = "SELECT * FROM $vote_table WHERE vote = 'B'";
$bar2q = $dbh->prepare($bar2sql);
$bar2q->execute();
$bar2count = $bar2q->rowCount();

//Get number of C-votes
$bar3sql = "SELECT * FROM $vote_table WHERE vote = 'C'";
$bar3q = $dbh->prepare($bar3sql);
$bar3q->execute();
$bar3count = $bar3q->rowCount();

//Get number of D-votes
$bar4sql = "SELECT * FROM $vote_table WHERE vote = 'D'";
$bar4q = $dbh->prepare($bar4sql);
$bar4q->execute();
$bar4count = $bar4q->rowCount();


//Mathematics bar 1
$bar1length = abs($bar1count/$total*100);

//Mathematics bar 2
$bar2length = abs($bar2count/$total*100);

//Mathematics bar 3
$bar3length = abs($bar3count/$total*100);

//Mathematics bar 4
$bar4length = abs($bar4count/$total*100);

$totals = json_encode(array("total"=>$total, "bar1"=>$bar1length, "bar2"
=>$bar2length, "bar3"=>$bar3length, "bar4"=>$bar4length));
echo $totals;


/* Testing count
echo "Total: ",$total, "<br />";
echo "Bar 1: ",$bar1count, "<br />";
echo "Bar 2: ",$bar2count, "<br />";
echo "Bar 3: ",$bar3count, "<br />";
echo "Bar 4: ",$bar4count, "<br />";
*/
//print_r($array);
?>

This is my error: Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '81.235.240.42' for key 2'