diff --git a/specs/openapi.json b/specs/openapi.json
index 3c5bd7c..c7e3cda 100644
--- a/specs/openapi.json
+++ b/specs/openapi.json
@@ -6403,9 +6403,6 @@
                       },
                       {
                         "$ref": "#/components/schemas/ThreadResponse"
-                      },
-                      {
-                        "type": "null"
                       }
                     ]
                   }
diff --git a/specs/openapi_preview.json b/specs/openapi_preview.json
index 2c1e27a..441b06a 100644
--- a/specs/openapi_preview.json
+++ b/specs/openapi_preview.json
@@ -6403,9 +6403,6 @@
                       },
                       {
                         "$ref": "#/components/schemas/ThreadResponse"
-                      },
-                      {
-                        "type": "null"
                       }
                     ]
                   }