From f47a87460dc1e4749687dc5c625ac7936209410e Mon Sep 17 00:00:00 2001
From: liyongning <396446793@qq.com>
Date: Fri, 24 Dec 2021 18:58:44 +0800
Subject: [PATCH] fix: #876

---
 src/runtimeContext.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/runtimeContext.ts b/src/runtimeContext.ts
index 3df241ff..8b4cbbeb 100644
--- a/src/runtimeContext.ts
+++ b/src/runtimeContext.ts
@@ -43,7 +43,8 @@ export function isPluginInstalled() {
 }
 
 export function isVueRegistered(Vue: VueConstructor) {
-  return hasOwn(Vue, PluginInstalledFlag)
+  // resolve issue: https://github.com/vuejs/composition-api/issues/876#issue-1087619365
+  return vueConstructor && hasOwn(Vue, PluginInstalledFlag)
 }
 
 export function getVueConstructor(): VueConstructor {