After migrating to Blueprint version 3, we experience this error everywhere we render a popper on click. Meaning this fires only on the click event which opens the Popover.

I see that this errors inside of the popover component itself. Checking the source code, popover is using react-popper. I have checked their Github issues thread and found nothing there.
Here is a simplified version of a common way we implement Popover:
<div className='common-filters__filters show-if-mid'>
<Popover
autoFocus={false}
popoverClassName='common-filters__sub-filters-popover'
position={Position.BOTTOM_RIGHT}
>
<div className='common-filters__collapsed-filters-opener'>
<i className='icon icon-cross2' />
<i className='icon icon-three-bars' />
</div>
<div className='common-filters__filters common-filters__sub-filters'>
{ ...more components }
</div>
</Popover>
</div>
@VincentNewkirk what version of React are you using?
@VincentNewkirk can you also share versions of popper.js and react-popper?
React: 16.3.1
react-popper: 1.3.2
popper.js: 1.14.6
@VincentNewkirk are you sure that's the only version of react? the stack trace screenshot shows react-popper/node_modules/react/... which suggests a nested _conflicting_ instance of react.
You're absolutely right. After investigation it seems we had a conflicting instance of React.
I'm not completely sure, but it seems it might be related to this known issue with Yarn:
https://github.com/yarnpkg/yarn/issues/3967
If anyone runs into this problem, I solved it by deleted my node_modules and running npm install. Not yarn install.
Most helpful comment
You're absolutely right. After investigation it seems we had a conflicting instance of React.
I'm not completely sure, but it seems it might be related to this known issue with Yarn:
https://github.com/yarnpkg/yarn/issues/3967
If anyone runs into this problem, I solved it by deleted my node_modules and running
npm install. Notyarn install.