diff --git a/examples/server/server.cpp b/examples/server/server.cpp
index b4aea465d..8d072878c 100644
--- a/examples/server/server.cpp
+++ b/examples/server/server.cpp
@@ -3349,8 +3349,7 @@ int main(int argc, char ** argv) {
             std::string content = body["content"];
             prompts.push_back(content);
         } else {
-            // TODO @ngxson : should return an error here
-            prompts.push_back("");
+            res_error(res, format_error_response("\"input\" or \"content\" must be provided", ERROR_INVALID_REQUEST));
         }
 
         // process all prompts
diff --git a/examples/server/tests/features/steps/steps.py b/examples/server/tests/features/steps/steps.py
index 142048509..a6762bff1 100644
--- a/examples/server/tests/features/steps/steps.py
+++ b/examples/server/tests/features/steps/steps.py
@@ -800,7 +800,7 @@ async def oai_chat_completions(user_prompt,
                 stream=enable_streaming,
                 seed=seed
             )
-        except openai.error.APIError as e:
+        except openai.error.AuthenticationError as e:
             if expect_api_error is not None and expect_api_error:
                 return 401
             else: