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The target’s resolveFork() returned nothing instead of a cursor. A built-in target returns nothing in two cases: none of the blocks it retained is on the canonical chain, or the fork reaches below the finalized block. Finalized data is never rolled back, so the pipe stops instead. Fix — in a custom target, return the cursor to resume from after rolling back. With a built-in target, the fork is deeper than the target’s retained history or reaches finalized blocks: report it, then index again from a block below the fork.