From 3357ff438c6ff0d4fea67923724dd3cb99ff2756 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 26 Feb 2020 21:43:27 -0500
Subject: [PATCH] fix(slots): fix conditional slot

fix #787
---
 packages/runtime-core/src/helpers/createSlots.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/packages/runtime-core/src/helpers/createSlots.ts b/packages/runtime-core/src/helpers/createSlots.ts
index b78b52ae3..c16aeed77 100644
--- a/packages/runtime-core/src/helpers/createSlots.ts
+++ b/packages/runtime-core/src/helpers/createSlots.ts
@@ -8,7 +8,10 @@ interface CompiledSlotDescriptor {
 
 export function createSlots(
   slots: Record<string, Slot>,
-  dynamicSlots: (CompiledSlotDescriptor | CompiledSlotDescriptor[])[]
+  dynamicSlots: (
+    | CompiledSlotDescriptor
+    | CompiledSlotDescriptor[]
+    | undefined)[]
 ): Record<string, Slot> {
   for (let i = 0; i < dynamicSlots.length; i++) {
     const slot = dynamicSlots[i]
@@ -17,7 +20,7 @@ export function createSlots(
       for (let j = 0; j < slot.length; j++) {
         slots[slot[j].name] = slot[j].fn
       }
-    } else {
+    } else if (slot) {
       // conditional single slot generated by <template v-if="..." #foo>
       slots[slot.name] = slot.fn
     }