google-chart

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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:

Yeah this is a bug, this happens when Google Charts receives an empty array:

data.addRows([]);

that's something that Google Charts should handle, instead of breaking. :(

You're right that there isn't a whole lot of error checking in cases like that. It'd be a good idea to not only handle that but also add some tests for these kinds of cases.

+1

You should wait for finish the request, put await or then after the request and wait it to end