diff --git a/python/sglang/srt/layers/logits_processor.py b/python/sglang/srt/layers/logits_processor.py
index fa7431048..fd272be6c 100644
--- a/python/sglang/srt/layers/logits_processor.py
+++ b/python/sglang/srt/layers/logits_processor.py
@@ -766,14 +766,19 @@ class LogitsProcessor(nn.Module):
 
             # Compute the logprobs of the chunk
             chunk_input_logprobs = chunk_logits[chunk_indices]
+            # Only index per-token arrays when the corresponding feature is active.
+            # Otherwise these tensors can be per-sequence (or scalars), which can
+            # cause out-of-bounds indexing on GPU.
             chunk_temperature = (
                 logits_metadata.temperature[global_indices]
-                if logits_metadata.temperature is not None
+                if logits_metadata.temp_scaled_logprobs
+                and logits_metadata.temperature is not None
                 else None
             )
             chunk_top_p = (
                 logits_metadata.top_p[global_indices]
-                if logits_metadata.top_p is not None
+                if logits_metadata.top_p_normalized_logprobs
+                and logits_metadata.top_p is not None
                 else None
             )
             chunk_input_logprobs = compute_temp_top_p_normalized_logprobs(
diff --git a/test/manual/test_logprobs.py b/test/manual/test_logprobs.py
index 8f817372c..5aa68c5dd 100644
--- a/test/manual/test_logprobs.py
+++ b/test/manual/test_logprobs.py
@@ -334,7 +334,8 @@ class TestLogprobsDense(unittest.TestCase):
                 print(f"Testing with config: {config}")
 
                 # Sample records for this config
-                test_records = random.sample(records, k=min(NUM_SAMPLES, len(records)))
+                num_samples = config.get("num_samples", NUM_SAMPLES)
+                test_records = random.sample(records, k=min(num_samples, len(records)))
                 random.shuffle(test_records)
 
                 # Calculate how many samples should return logprobs