TypeError: Cannot read properties of null (reading 'deactivate')

[mjadobson]

Describe the bug

After a boundary has caught an error in $derived await, if a reset() is performed, the following error is thrown:

Uncaught (in promise) TypeError: Cannot read properties of null (reading 'deactivate')
    at unsuspend (playground:output:2265:11)
    at async_body (playground:output:1673:4)

svelte/packages/svelte/src/internal/client/reactivity/batch.js

Line 685 in 942eaf0

batch.deactivate();

Reproduction

https://svelte.dev/playground/dcd78c4674c24e82b6cb78423c248fbf?version=5.38.5

System Info

Svelte 5.38.5

Severity

annoyance