From cd06786d162318323f58387cf00313a0516394c3 Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Mon, 9 Apr 2018 06:13:32 -0700
Subject: [PATCH] Fix exception when reset is called before open

Fixes #1379
---
 src/Terminal.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Terminal.ts b/src/Terminal.ts
index e441a5b4..3144ae93 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -2169,7 +2169,9 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     this._customKeyEventHandler = customKeyEventHandler;
     this._inputHandler = inputHandler;
     this.refresh(0, this.rows - 1);
-    this.viewport.syncScrollArea();
+    if (this.viewport) {
+      this.viewport.syncScrollArea();
+    }
   }