From 23169e89c8c65464c8bf16374e07b4e7669b843c Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Thu, 12 Jan 2017 11:14:14 -0800
Subject: [PATCH 1/2] Add null checks to refresh line and character fetches

Fixes #473
---
 src/xterm.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/xterm.js b/src/xterm.js
index b6c659c3..a46d0152 100644
--- a/src/xterm.js
+++ b/src/xterm.js
@@ -1139,6 +1139,10 @@ Terminal.prototype.refresh = function(start, end) {
     row = y + this.ydisp;
 
     line = this.lines.get(row);
+    if (!line) {
+      // Continue if the line is not available, this means a resize is currently in progress
+      continue;
+    }
     out = '';
 
     if (this.y === y - (this.ybase - this.ydisp)
@@ -1153,6 +1157,10 @@ Terminal.prototype.refresh = function(start, end) {
     i = 0;
 
     for (; i < width; i++) {
+      if (!line[i]) {
+        // Continue if the character is not available, this means a resize is currently in progress
+        continue;
+      }
       data = line[i][0];
       ch = line[i][1];
       ch_width = line[i][2];

From 3de3912b96dce8ef1d900108cd64412ea19eb11a Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Thu, 12 Jan 2017 11:23:17 -0800
Subject: [PATCH 2/2] Add another null check on children[y]

---
 src/xterm.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/xterm.js b/src/xterm.js
index a46d0152..b01421b1 100644
--- a/src/xterm.js
+++ b/src/xterm.js
@@ -1139,7 +1139,7 @@ Terminal.prototype.refresh = function(start, end) {
     row = y + this.ydisp;
 
     line = this.lines.get(row);
-    if (!line) {
+    if (!line || !this.children[y]) {
       // Continue if the line is not available, this means a resize is currently in progress
       continue;
     }