diff --git a/python/sglang/srt/managers/schedule_batch.py b/python/sglang/srt/managers/schedule_batch.py
index 05125bd3a..e49ad99f6 100644
--- a/python/sglang/srt/managers/schedule_batch.py
+++ b/python/sglang/srt/managers/schedule_batch.py
@@ -1551,6 +1551,9 @@ class ScheduleBatch(ScheduleBatchDisaggregationDecodeMixin):
             extend_input_logprob_token_ids = torch.tensor(
                 extend_input_logprob_token_ids
             )
+            # Clamp placeholder or out-of-range token IDs (e.g., multimodal hashes)
+            # so they stay within the vocab boundary before being sent to GPU.
+            extend_input_logprob_token_ids.clamp_(0, self.model_config.vocab_size - 1)
         else:
             extend_input_logprob_token_ids = None