diff --git a/ocsigenserver.opam b/ocsigenserver.opam
index 7512cd386..e8d0a1c70 100644
--- a/ocsigenserver.opam
+++ b/ocsigenserver.opam
@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "ocsigenserver"
-version: "4.0.1"
+version: "4.0.2"
 maintainer: "dev@ocsigen.org"
 synopsis: "A full-featured and extensible Web server"
 description: "Ocsigen Server implements most features of the HTTP protocol, and has a very powerful extension mechanism that makes it very easy to plug your own OCaml modules for generating pages. Many extensions are already implemented, like a reverse proxy, content compression, access control, authentication, etc."
diff --git a/src/server/ocsigen_request.ml b/src/server/ocsigen_request.ml
index 2b855dd1c..5e55590b1 100644
--- a/src/server/ocsigen_request.ml
+++ b/src/server/ocsigen_request.ml
@@ -174,7 +174,9 @@ let update
     match post_data with
     | Some (Some post_data) ->
       ref (`Parsed (Lwt.return post_data))
-    | None | Some None ->
+    | Some None ->
+      ref (`Parsed (Lwt.return ([], [])))
+    | None ->
       r_body
   and r_cookies_override =
     match cookies_override with