diff --git a/internal/jshttp/request.go b/internal/jshttp/request.go
index ae2b0f63..cd752267 100644
--- a/internal/jshttp/request.go
+++ b/internal/jshttp/request.go
@@ -1,6 +1,7 @@
 package jshttp
 
 import (
+	"bytes"
 	"io"
 	"net/http"
 	"net/url"
@@ -15,7 +16,7 @@ import (
 //   - ReadableStream: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream
 func ToBody(streamOrNull js.Value) io.ReadCloser {
 	if streamOrNull.IsNull() {
-		return nil
+		return io.NopCloser(bytes.NewReader([]byte{}))
 	}
 	return jsutil.ConvertReadableStreamToReadCloser(streamOrNull)
 }