Problem displaying zero values in bar chart

Question

I'm having trouble displaying zero values on pChart-driven bar charts. The zero-value bar turns into a large triangular shape that extends across the entire chart.

Zero values seem to be the only problem.

Any help would be appreciated.

Problem bar chart

Here's my code:

function createScoreChart($data,$filename,$title)   {
    $myData = new Data();
    for($i=0;$i<105;$i=$i+5)    {
        if($data[$i])   {
            $myData->addPoints($data[$i],"Scores");
            if($data[$i] > $maxQuantity)    {
                $maxQuantity = $data[$i];
            }
        }
        else    {
            $myData->addPoints('VOID',"Scores");
        }
    }

    /* Set line weight */
    $myData->setSerieWeight("Scores",1);

    $serieSettings = array("R"=>87,"G"=>135,"B"=>178,"Alpha"=>100);
    $myData->setPalette("Scores",$serieSettings);

    /* Create labels */
    for($i=0;$i<105;$i=$i+5)    {
        $myData->addPoints($i . '%',"Labels");
    }

    $myData->setAbscissa("Labels");    
    $myData->setAxisPosition(0,AXIS_POSITION_LEFT);

    /* Create the pChart object */
    $myPicture = new Image(800,400,$myData);
    
    /* Draw a solid background */
    $myPicture->drawFilledRectangle(0, 0, 799, 399, [
        "R" => 247,
        "G" => 247,
        "B" => 247
    ]);

    /* Add a border to the picture */
    $myPicture->drawRectangle(0,0,799,399);

    /* Write the picture title */
    $myPicture->setFontProperties(array("FontName"=>$_SERVER['DOCUMENT_ROOT'] . "/admin/includes/verdana-bold.ttf","FontSize"=>16));
    $myPicture->drawText(400,35,$title, array("Align"=>TEXT_ALIGN_MIDDLEMIDDLE));

    /* Set the default font properties */
    $myPicture->setFontProperties(array("FontName"=>$_SERVER['DOCUMENT_ROOT'] . "/admin/includes/verdana.ttf","FontSize"=>9));

    /* Draw the chart scale */
    $myPicture->setGraphArea(40,50,760,360);

    $AxisBoundaries = array(0=>array("Min"=>0,"Max"=>$maxQuantity));
    $ScaleSettings  = array("Mode"=>SCALE_MODE_MANUAL,"ManualScale"=>$AxisBoundaries,"DrawSubTicks"=>TRUE,"DrawArrows"=>FALSE,"ArrowSize"=>0);
    $myPicture->drawScale($ScaleSettings);
    
    /* Draw the scale, keep everything automatic */
    $myPicture->drawFilledStepChart(array("DisplayColor"=>'#000000'));

    /* Save the picture to server */
    $myPicture->Render($_SERVER['DOCUMENT_ROOT'] . '/admin/tmp/' . $filename);
}