From 9e1551e2f14f76d098b2b8d293dd6c3ef57d7255 Mon Sep 17 00:00:00 2001
From: Daniel Imms <daimms@microsoft.com>
Date: Thu, 11 Oct 2018 09:37:19 -0700
Subject: [PATCH] Fix NPE in DOM renderer underline

Fixes #1747
---
 src/renderer/dom/DomRenderer.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/renderer/dom/DomRenderer.ts b/src/renderer/dom/DomRenderer.ts
index 8f51c4ef3e..adce57bcd3 100644
--- a/src/renderer/dom/DomRenderer.ts
+++ b/src/renderer/dom/DomRenderer.ts
@@ -352,7 +352,11 @@ export class DomRenderer extends EventEmitter implements IRenderer {
 
   private _setCellUnderline(x: number, x2: number, y: number, y2: number, cols: number, enabled: boolean): void {
     while (x !== x2 || y !== y2) {
-      const span = <HTMLElement>this._rowElements[y].children[x];
+      const row = this._rowElements[y];
+      if (!row) {
+        return;
+      }
+      const span = <HTMLElement>row.children[x];
       span.style.textDecoration = enabled ? 'underline' : 'none';
       x = (x + 1) % cols;
       if (x === 0) {