diff --git a/vllm/v1/worker/gpu/model_runner.py b/vllm/v1/worker/gpu/model_runner.py
index 6ff15d6498d90..1399fd2e88c2b 100644
--- a/vllm/v1/worker/gpu/model_runner.py
+++ b/vllm/v1/worker/gpu/model_runner.py
@@ -404,8 +404,7 @@ class GPUModelRunner:
 
         needs_prompt_logprobs = np.any(
             self.req_states.needs_prompt_logprobs[idx_mapping_np])
-        if needs_prompt_logprobs:
-            pass
+        assert not needs_prompt_logprobs
 
         if use_dp_sampler:
             # All-gather the outputs.