From 7976b7990bfda3c04b7008a6fc144275411a9aa5 Mon Sep 17 00:00:00 2001
From: Rich Harris <richard.a.harris@gmail.com>
Date: Wed, 30 Jan 2019 14:27:39 -0500
Subject: [PATCH] make callback optional

---
 src/internal/scheduler.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/internal/scheduler.js b/src/internal/scheduler.js
index bc4e14b96d..7292c85f07 100644
--- a/src/internal/scheduler.js
+++ b/src/internal/scheduler.js
@@ -19,7 +19,7 @@ export function add_render_callback(fn) {
 }
 
 export function nextTick(fn) {
-	add_render_callback(fn);
+	if (fn) add_render_callback(fn);
 	schedule_update();
 	return update_promise;
 }