Same happening for me when I update NuGet package to the newer versions. On 2.12.1 version everything working fine, but with like 2.15.3 I get this error message too when I'm using the new Confirm Dialog component and I also trigger it with a dropdown change event (not 100% that is the problem, but for start is good to know, and the script include is also works perfectly). I hope I found a workaround or a fix because I need newer version of the NuGet package where the dropdown autofocus is fixed.
Seems like working with cache clear, but now I can open all my disabled dropdown and select the item (and no exception), probably a new bug, yet I don't know its just only for me.