From 777a4b7f5033c86c37cbd93008f3ca792e4af8bc Mon Sep 17 00:00:00 2001
From: Matteo Rigon <matteo.rigon7@gmail.com>
Date: Fri, 17 Dec 2021 14:20:07 +0100
Subject: [PATCH] fix(vue-app): call ssrContext.unsetMutationObserver only if
 it exists (#10132)

[release]
---
 packages/vue-app/template/server.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/packages/vue-app/template/server.js b/packages/vue-app/template/server.js
index f92ce4c7bc..e545204e71 100644
--- a/packages/vue-app/template/server.js
+++ b/packages/vue-app/template/server.js
@@ -134,7 +134,10 @@ export default async (ssrContext) => {
 
       <% if (isFullStatic && store) { %>
       // Stop recording store mutations
-      ssrContext.unsetMutationObserver()
+      // unsetMutationObserver is only set after all router middleware are evaluated
+      if (ssrContext.unsetMutationObserver) {
+        ssrContext.unsetMutationObserver()
+      }
       <% } %>
     }
   }