From c7248a2d236be0fa1521649769ec854595c1174f Mon Sep 17 00:00:00 2001
From: Aaron Pham <29749331+aarnphm@users.noreply.github.com>
Date: Mon, 31 Oct 2022 13:00:05 -0700
Subject: [PATCH] fix: pandas openAPI handle nulltype

Signed-off-by: Aaron Pham <29749331+aarnphm@users.noreply.github.com>
---
 src/bentoml/_internal/io_descriptors/pandas.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/bentoml/_internal/io_descriptors/pandas.py b/src/bentoml/_internal/io_descriptors/pandas.py
index 84676b501d..90e44ec69a 100644
--- a/src/bentoml/_internal/io_descriptors/pandas.py
+++ b/src/bentoml/_internal/io_descriptors/pandas.py
@@ -356,6 +356,8 @@ def _convert_dtype(
             return str(value)
         elif isinstance(value, dict):
             return {str(k): self._convert_dtype(v) for k, v in value.items()}
+        elif value is None:
+            return "null"
         else:
             logger.warning(f"{type(value)} is not yet supported.")
             return None
@@ -822,6 +824,8 @@ def _convert_dtype(
             return str(value)
         elif isinstance(value, dict):
             return {str(k): self._convert_dtype(v) for k, v in value.items()}
+        elif value is None:
+            return "null"
         else:
             logger.warning(f"{type(value)} is not yet supported.")
             return None