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[BugFix] Fix spec decode + structured outputs + preemption edge case #30916

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Merged
njhill merged 1 commit into from
Dec 18, 2025
Merged

[BugFix] Fix spec decode + structured outputs + preemption edge case #30916

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6 changes: 5 additions & 1 deletion vllm/v1/worker/gpu_model_runner.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3398,9 +3398,13 @@ def propose_draft_token_ids(sampled_token_ids):
return async_output

def take_draft_token_ids(self) -> DraftTokenIds | None:
if self._draft_token_ids is None:
if not self.num_spec_tokens:
return None

req_ids = self.input_batch.req_ids
if self._draft_token_ids is None:
return DraftTokenIds(req_ids, [[] for _ in req_ids])

if isinstance(self._draft_token_ids, torch.Tensor):
draft_token_ids = self._draft_token_ids.tolist()
else:
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