[E2B-446] WS error when closing sandbox during stream `end` event

[ValentaTomas]

When closing sandbox during the end event of stream (edge) there are sometimes the following errors:

TypeError: Cannot read properties of null (reading 'toString') at ws.onmessage

Awaiting response to "filesystem_subscribe" with id: 1YnoY73JVUFS timed out.

We are not sure if this happens because the sandbox is closed before the last message arrives or because of something else.

(https://e2b-team.slack.com/archives/C069TGQ9Z8T/p1702595858160579?thread_ts=1702490734.887939&cid=C069TGQ9Z8)

_E2B-446