diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 46236a56..159ea519 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## 3.1.9 (2022-04-17)
 
+- fix #1174: pydantic validation error when body is None
 - fix #1209: only convert jmespath path for some fields in white list
 - fix #1233: parse upload info with session variables
 - fix #1246: catch exceptions when getting socket address failed
diff --git a/httprunner/models.py b/httprunner/models.py
index e149e407..65c4446a 100644
--- a/httprunner/models.py
+++ b/httprunner/models.py
@@ -133,7 +133,7 @@ class ResponseData(BaseModel):
     cookies: Cookies
     encoding: Union[Text, None] = None
     content_type: Text
-    body: Union[Text, bytes, List, Dict]
+    body: Union[Text, bytes, List, Dict, None]
 
 
 class ReqRespData(BaseModel):
@@ -161,7 +161,7 @@ class StepData(BaseModel):
     data: Union[SessionData, List['StepData']] = None
     export_vars: VariablesMapping = {}
 
-        
+
 StepData.update_forward_refs()