see if the following fix works:
function drawChart() {
var __instance__ = arguments.callee;
var data = google.visualization.arrayToDataTable(<your data here>);
var chartCnt = document.getElementById('chart-container');
!__instance__.testChart &&
(__instance__.testChart = new google.visualization.BarChart(chartCnt));
__instance__.testChart.clearChart();
__instance__.testChart.draw(data, { width:600, height:400 });
}
ref: https://groups.google.com/forum/#!topic/google-visualization-api/QoCPFv1tKkQ
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