Oops, that looks like an IndexedDB error. IDBD is a browser database. In the case of Meteor, it is used for caching dynamic imports.
It rings a bell. I saw this before, here: "Failed to execute 'transaction' on 'IDBDatabase': The database connection is closing." – what?. The OP describes how he traced the origin of the error. It may be worth asking @peterfkruger how he debugged it.