diff --git a/vllm/config.py b/vllm/config.py
index a5512c65..db4398ad 100644
--- a/vllm/config.py
+++ b/vllm/config.py
@@ -353,7 +353,8 @@ class CacheConfig:
         elif self.cache_dtype == "fp8":
             if not is_hip():
                 nvcc_cuda_version = get_nvcc_cuda_version()
-                if nvcc_cuda_version < Version("11.8"):
+                if nvcc_cuda_version is not None \
+                        and nvcc_cuda_version < Version("11.8"):
                     raise ValueError(
                         "FP8 is not supported when cuda version is"
                         "lower than 11.8.")