diff --git a/plugins/fiber/fiber.c b/plugins/fiber/fiber.c
index 9eaffeee..63ea3210 100644
--- a/plugins/fiber/fiber.c
+++ b/plugins/fiber/fiber.c
@@ -58,11 +58,13 @@ void fiber_loop() {
         uwsgi.schedule_to_main = fiber_schedule_to_main;
         uwsgi.schedule_to_req = fiber_schedule_to_req;
 
+	ur.unprotected = 1;
+
         rb_protect(protected_async_loop, 0, &error);
 
         if (error) {
                 uwsgi_ruby_exception();
-                exit(1);
+		exit(1);
         }
 
         // never here
diff --git a/plugins/rack/rack_plugin.c b/plugins/rack/rack_plugin.c
index 3096c339..0dfc442d 100644
--- a/plugins/rack/rack_plugin.c
+++ b/plugins/rack/rack_plugin.c
@@ -590,7 +590,6 @@ int uwsgi_rack_request(struct wsgi_request *wsgi_req) {
 
 	rb_hash_aset(env, rb_str_new2("rack.errors"), rb_funcall( rb_const_get(rb_cObject, rb_intern("IO")), rb_intern("new"), 2, INT2NUM(2), rb_str_new("w",1) ));
 
-
 	ret = rb_protect( call_dispatch, env, &error);
 	if (error) {
 		uwsgi_ruby_exception();
@@ -674,9 +673,14 @@ int uwsgi_rack_request(struct wsgi_request *wsgi_req) {
 			}
 		}
 		else if (rb_respond_to( body, rb_intern("each") )) {
-			rb_protect( iterate_body, body, &error);
-			if (error) {
-				uwsgi_ruby_exception();
+			if (ur.unprotected) {
+				iterate_body(body);
+			}
+			else {
+				rb_protect( iterate_body, body, &error);
+				if (error) {
+					uwsgi_ruby_exception();
+				}
 			}
 		}
 
diff --git a/plugins/rack/uwsgi_rack.h b/plugins/rack/uwsgi_rack.h
index c67613a8..5ba0c789 100644
--- a/plugins/rack/uwsgi_rack.h
+++ b/plugins/rack/uwsgi_rack.h
@@ -69,6 +69,8 @@ struct uwsgi_rack {
 	int rb_shell;
 	int app_id;
 
+	int unprotected;
+
 	struct uwsgi_string_list *rbrequire;
 
 };