Not that simply doing ``` let { workers } = await tabTarget.listWorkers(); workers = workers || []; ``` at https://searchfox.org/mozilla-central/rev/dbddac86aadf1d4871fb350bbe66db43728a9f81/devtools/client/debugger/new/src/client/firefox/workers.js#27 "fixes" the issue.
Bug 1530861 Comment 1 Edit History
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Note that simply doing ``` let { workers } = await tabTarget.listWorkers(); workers = workers || []; ``` at https://searchfox.org/mozilla-central/rev/dbddac86aadf1d4871fb350bbe66db43728a9f81/devtools/client/debugger/new/src/client/firefox/workers.js#27 "fixes" the issue.