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[Bugfix] Catch and log invalid token ids in detokenizer #24351

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Merged
merged 1 commit into from
Sep 6, 2025
Merged

[Bugfix] Catch and log invalid token ids in detokenizer #24351

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5 changes: 5 additions & 0 deletions vllm/v1/engine/detokenizer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -233,6 +233,11 @@ def decode_next(self, next_token_id: int) -> str:
def _protected_step(self, next_token_id: int) -> Optional[str]:
try:
token = self.stream.step(self.tokenizer, next_token_id)
except OverflowError:
# Handle rare observed overflow, still to be diagnosed.
# See https://github.com/vllm-project/vllm/issues/21951.
logger.exception("Encountered invalid token id: %d", next_token_id)
token = None
except Exception as e:
if not str(e).startswith(INVALID_PREFIX_ERR_MSG):
raise e
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