From 877e1e5eb30cdd8a9f4a9073a97b81c81a59dac4 Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Mon, 21 Aug 2017 14:30:52 -0700
Subject: [PATCH] Prevent scrollback setOption < 0

Fixes #911
---
 src/Terminal.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Terminal.ts b/src/Terminal.ts
index a17cf94a..03babac5 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -454,6 +454,10 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
         }
         break;
       case 'scrollback':
+        if (value < 0) {
+          console.warn(`scrollback cannot be less than 0, value: ${value}`);
+          return;
+        }
         if (this.options[key] !== value) {
           const newBufferLength = this.rows + value;
           if (this.buffer.lines.length > newBufferLength) {