I occasionally see this error in my console. (See attached screenshot.) I have not found a way to reliably reproduce it, but it seems a bit of defensive code on your end would clear it up. We are on 15.3.0.
Thanks.
Hi @dhaber
I do not see any similar reports on our Github issue board.
We can see that it comes from the mouseover hook while using nestedHeaders. Do you get it when you perform such an action? Any details regarding steps to replicate the issue and a demo would help us much as with no related reports and our nestedHeaders demo showing no errors there’s not much I can do to help.
Understood. Next time it happens I’ll spend more time to see if I can isolate what series of steps triggers it.
Thanks.
Hi @dhaber
Were you able to investigate the subject further?
Hi @aleksandra_budnik. I’ll take a look in the next day or two and get back to you.
Thanks.
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We are still seeing this exception hundreds of times a day in our New Relic monitoring. I have uploaded the stack trace as captured by New Relic. Please let me know if that gives you more to work on. Thanks.
Thank you for sharing screenshots, @dhaber
I tried to replicate it in the documentation, but wasn’t able to. Do you get this error on any demo of our documentation? Here is the link Column groups - React Data Grid | Handsontable
Perhaps it is also system/browser-related. I am on macOS 26 Chrome 142 (no scale/zoom applied).
If that is replicable only in your application, I would need to ask for a demo. You can also check if updating to v16.2.0 (latest version) changes the outcome. You can also post what features do you use along with nestedHeaders and I’ll try to replicate it in a sandbox.