From 5fb23d4e2971480d14fbee0146e3416a07bc0b9f Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 9 Jan 2019 22:47:11 -0500
Subject: [PATCH] fix: ensure only nromalize a scoped slot when it is present

---
 src/core/vdom/helpers/normalize-scoped-slots.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/core/vdom/helpers/normalize-scoped-slots.js b/src/core/vdom/helpers/normalize-scoped-slots.js
index 239d9a9019b..15aa7b134ee 100644
--- a/src/core/vdom/helpers/normalize-scoped-slots.js
+++ b/src/core/vdom/helpers/normalize-scoped-slots.js
@@ -12,7 +12,9 @@ export function normalizeScopedSlots (
   } else {
     res = {}
     for (const key in slots) {
-      res[key] = normalizeScopedSlot(slots[key])
+      if (slots[key]) {
+        res[key] = normalizeScopedSlot(slots[key])
+      }
     }
   }
   // expose normal slots on scopedSlots