I'm using Dart + Polymer and we were creating a new version of our app, that was going with huge refactoring, deleting some pages and so on.
Now, there is a error
TypeError: Invalid value used as weak map key
I assume it is somehow connected to Iron List receiving null data, or some other polymer elements missing something.
But there is no valuable information in stack trace. Is there any way to debug this error, so I can understand the origin of this error?