diff --git a/openai/validators.py b/openai/validators.py
index ce34e2d76a..7e8a691344 100644
--- a/openai/validators.py
+++ b/openai/validators.py
@@ -480,6 +480,8 @@ def read_any_format(fname):
                 )
             else:
                 error_msg += f" Your file `{fname}` does not appear to have a file ending. Please ensure your filename ends with one of the supported file endings."
+        else:
+            df.fillna("", inplace=True)
     else:
         error_msg = f"File {fname} does not exist."
 
diff --git a/openai/version.py b/openai/version.py
index 976684abd7..3efa2fa44e 100644
--- a/openai/version.py
+++ b/openai/version.py
@@ -1 +1 @@
-VERSION = "0.9.0"
+VERSION = "0.9.1"