Uncaught Error: Assertion Failed: The `element` helper polyfill encountered an unexpected error

Hi! Please can someone help me with this error?
I can't solve it and I'm thinking it's a bug.

**Error:**
```
Uncaught Error: Assertion Failed: The `element` helper polyfill encountered an unexpected error. Please report the issue at http://github.com/tildeio/ember-element-helper with the usage and conditions that caused this error.
at assert (index.js:181:1)
at element.js:14:1
at index.js:5258:1
at deprecateMutationsInTrackingTransaction (validator.js:191:1)
at index.js:5257:1
at SimpleClassicHelperManager.getValue (index.js:5268:1)
at manager.js:971:1
at reference.js:170:1
at track (validator.js:835:1)
at valueForRef (reference.js:169:1)
```

**package.json**
```
shell>cat package.json | grep leaflet
"ember-leaflet": "^5.0.1",
"leaflet": "^1.8.0",
```

**Environment:**
```
shell>ember -v
ember-cli: 3.28.5
node: 14.15.5
os: linux x64
```

**Printscreen:**