diff --git a/vllm/entrypoints/openai/api_server.py b/vllm/entrypoints/openai/api_server.py
index 0f1a09b7..bc827b34 100644
--- a/vllm/entrypoints/openai/api_server.py
+++ b/vllm/entrypoints/openai/api_server.py
@@ -196,7 +196,7 @@ async def create_chat_completion(request: ChatCompletionRequest,
     if error_check_ret is not None:
         return error_check_ret
 
-    if request.logit_bias is not None:
+    if request.logit_bias is not None and len(request.logit_bias) > 0:
         # TODO: support logit_bias in vLLM engine.
         return create_error_response(HTTPStatus.BAD_REQUEST,
                                      "logit_bias is not currently supported")
@@ -379,7 +379,7 @@ async def create_completion(request: CompletionRequest, raw_request: Request):
         return create_error_response(HTTPStatus.BAD_REQUEST,
                                      "suffix is not currently supported")
 
-    if request.logit_bias is not None:
+    if request.logit_bias is not None and len(request.logit_bias) > 0:
         # TODO: support logit_bias in vLLM engine.
         return create_error_response(HTTPStatus.BAD_REQUEST,
                                      "logit_bias is not currently supported")