From ea7571c2b91e99df37ca1e1009c28b25e528e923 Mon Sep 17 00:00:00 2001
From: Daniel Imms <2193314+Tyriar@users.noreply.github.com>
Date: Fri, 16 Dec 2022 10:42:05 -0800
Subject: [PATCH] Fix NPE in webgl renderer

Theory is this can happen when a resize down happens as end will be too big

See microsoft/vscode#166878
---
 addons/xterm-addon-webgl/src/WebglRenderer.ts | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/addons/xterm-addon-webgl/src/WebglRenderer.ts b/addons/xterm-addon-webgl/src/WebglRenderer.ts
index db379214..3cbd429c 100644
--- a/addons/xterm-addon-webgl/src/WebglRenderer.ts
+++ b/addons/xterm-addon-webgl/src/WebglRenderer.ts
@@ -351,7 +351,7 @@ export class WebglRenderer extends Disposable implements IRenderer {
     let lastBg: number;
     let y: number;
     let row: number;
-    let line: IBufferLine;
+    let line: IBufferLine | undefined;
     let joinedRanges: [number, number][];
     let isJoined: boolean;
     let lastCharX: number;
@@ -364,7 +364,10 @@ export class WebglRenderer extends Disposable implements IRenderer {
 
     for (y = start; y <= end; y++) {
       row = y + terminal.buffer.ydisp;
-      line = terminal.buffer.lines.get(row)!;
+      line = terminal.buffer.lines.get(row);
+      if (!line) {
+        break;
+      }
       this._model.lineLengths[y] = 0;
       joinedRanges = this._characterJoinerService.getJoinedCharacters(row);
       for (x = 0; x < terminal.cols; x++) {