[Error] InvalidStateError: Failed to execute 'transaction' on 'IDBDatabase': The database connection is closing.

### [REQUIRED] Describe your environment

* Operating System version: iOS Version:13.3.1
* Browser version: Mobile Safari Version:13.0.5
* Firebase SDK version: 7.9.1
* Firebase Product: firestore

### [REQUIRED] Describe the problem

#### Steps to reproduce:
I can't reliably reproduce it so not entirely sure what specifically causes it but here is the Sentry error:
https://sentry.io/share/issue/03f7cacb9f394cdd9867f13ad40345d8/
Once this errors subsequent requests start failing like this:
https://sentry.io/share/issue/aab1ab9ce88e4d50a3e40edbc27c0700/

#### Relevant Code:
This is my firebase setup:
https://github.com/AugustinGrigorov/vocabulary-builder/blob/master/src/utils/firebase.js