postMessage error on Cancel current action brick

[Pashaminkovsky]

Unable to reproduce on my end, but I am seeing an error in the logs for a deployment for announcement. Will include screenshot in thread ; also saw render nunjucks error

[twschiller]

As per thread, postMessage error likely thrown while messaging the sandbox to evaluate the condition for the brick: https://pixiebrix.slack.com/archives/C0436P48QHY/p1729544374033449

[fungairino]

Sample rum error log in datadog

https://app.datadoghq.com/logs?query=%22cannot%20read%20properties%20of%20null%22&agg_m=count&agg_m_source=base&agg_t=count&cols=host%2Cservice&event=AgAAAZK0uu3z99yt3AAAAAAAAAAYAAAAAEFaSzB1Mkg2QUFBQVZkcEYyVktHTFFBQQAAACQAAAAAMDE5MmI0YmItN2FhYy00NTgxLWExY2UtMDliNDYwNDgyZTZk&fromUser=true&messageDisplay=inline&refresh_mode=sliding&storage=hot&stream_sort=desc&viz=stream&from_ts=1729526420769&to_ts=1729612820769&live=true

[fungairino]

The error is happening here, where recipient is null

pixiebrix-extension/src/sandbox/postMessage.ts

Line 130 in 786e594

recipient.postMessage(packet, "*", [privateChannel.port2]);

getSandbox seems to be able to return null. Typescript is inferring the wrong return value for this function.

pixiebrix-extension/src/sandbox/messenger/api.ts

Line 105 in 810e62b

recipient: await getSandbox(),

[fungairino]

For the purposes of this reported bug, I think we can close this issue and track more specific sandbox improvements that we are planning in #9150