diff --git a/Tagfile b/Tagfile
index 4f9b378b..27d68a6a 100644
--- a/Tagfile
+++ b/Tagfile
@@ -1 +1 @@
-0.52.0
+0.52.1
diff --git a/pkg/runtime/cx_request_before_request.go b/pkg/runtime/cx_request_before_request.go
index 3eb872b7..cad59496 100644
--- a/pkg/runtime/cx_request_before_request.go
+++ b/pkg/runtime/cx_request_before_request.go
@@ -103,7 +103,9 @@ func (cr *cxRequestBeforeRequest) Truth() starlark.Bool { return true }
 func (cr *cxRequestBeforeRequest) Type() string         { return cr.ty }
 
 func (cr *cxRequestBeforeRequest) Freeze() {
-	cr.body.Freeze()
+	if cr.body != nil {
+		cr.body.Freeze()
+	}
 	cr.headers.Freeze()
 	cr.method.Freeze()
 	cr.url.Freeze()