TypeError: undefined is not an object (evaluating 'this.l[e.type+!1]')

[kristersd]

Describe the bug
Preact eventsProxy throws a run-time error when this._listeners is not present on the DOM node.

To Reproduce

1. Go to Preact REPL on Safari.
2. Mouse over and mouse leave the example elements.
3. Observe error after couple tries.

Device
I was able to reproduce it consistently while using Safari 17.

Safari Version 17.0 (18616.1.27.111.22, 18616)

Expected behavior
Preact does not throw an error, if unable to access this._listeners inside event listener.

Screen.Recording.2024-01-04.at.18.27.20.mov

[kristersd]

@marvinhagemeister Thanks for transferring the issue to preact-www but this is not related to the REPL and happens inside preact source code. You can take the example code from REPL and reproduce it elsewhere.