I am seeing what appears to be a bug with the line chart API: https://developers.google.com/chart/interactive/docs/gallery/linechart here is the problem: https://stackoverflow.com/questions/49122990/getting-cannot-read-property-vb-of-undefined-error-with-google-chart-api the error appears to be internal to the Chart API lib: <img width="331" alt="screenshot 2018-03-05 19 48 38" src="https://user-images.githubusercontent.com/11139560/37013414-9cd54044-20ae-11e8-987b-1371c60ca1ea.png">