Compatibility with `delegated-events`

When I try to use this lib with `delegated-events` (https://github.com/dgraham/delegated-events), I get this error:
```
TypeError
undefined is not an object (evaluating 'matched.observers[j].data.call')
```

Demo: https://codesandbox.io/s/awesome-leftpad-9gtgo?file=/src/index.js