Php/javascript undefined index error

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PHP

Hi,i have a undefined index when I declare my dropdown in php like this

$selectAction = '<select id="compAction" name="compAction" style="font-size: 12px" onChange="actionSelect(),document.redemptionsForm.submit();">';
foreach($arr as $option => $item){
$selectAction .= "<option id='" . $item . "' value='" . $item . "' " .
(($compAction == $item)?'selected':' ') . ">" . $item . "</option>\n";

}
$selectAction.="</select>";


what could the issue be?