From b3857bd69038f2cbb652858345d4dbd7618eb3eb Mon Sep 17 00:00:00 2001
From: Christian Davis <Christiand@csu.fullerton.edu>
Date: Tue, 17 Oct 2017 21:24:34 -0500
Subject: [PATCH] fix(page): page.close() assert that connection is not closed
 (#1038)

---
 lib/Connection.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Connection.js b/lib/Connection.js
index fa4501b0335..dbf1ea8fc54 100644
--- a/lib/Connection.js
+++ b/lib/Connection.js
@@ -201,6 +201,7 @@ class Session extends EventEmitter {
   }
 
   async dispose() {
+    console.assert(!!this._connection, 'Protocol error: Connection closed. Most likely the page has been closed.');
     await this._connection.send('Target.closeTarget', {targetId: this._targetId});
   }