Hi all ... I'm loading a viz in an iframe and am occasionally seeing this error as it loads:

Unexpected Error

An unexpected error occurred. If you continue to receive this error please contact your Tableau Server Administrator.

Uncaught TypeError: Cannot read property 'toString' of undefined

and sometimes:

An unexpected error occurred. If you continue to receive this error please contact your Tableau Server Administrator.

Session ID: FB9AEC6478CA4CA29379250F22828D0F-0:0

Uncaught TypeError: Cannot read property 'toString' of undefined

In my testing it doesn't seem to throw the error every time the page loads, but pretty often. And it seems to not throw the error if I don't use the url parameters.

Iframe code:

<iframe src="https://public.tableau.com/views/ColoradoDivide/ColoradoPopulation1970-2050?:embed=true&:showVizHome=no" width="100%" height="2000px" allowfullscreen="yes" scrolling="yes"></iframe>

Colorado’s population could increase by nearly 3 million people by 2050, according to forecast numbers – The Denver Post

I just checked and another one is throwing the error, too.

I pulled it into Tableau 10.5 desktop and resaved it to see if that would have any effect -- it didn't. I also saved it to Tableau Public with a different name, and that didn't work.

We recently converted the website to https -- could that have something to do with it? I saw this thread: Uncaught TypeError: Cannot read property 'toString' of null ... but the filter issues it mentions don't apply.

I'm including the workbook, too (10.5).

Any help is appreciated!

Thanks ... Kevin