From 9a1162d7f2fbfc7106f0b217a92326d32bd6101e Mon Sep 17 00:00:00 2001
From: jpoth <poth.john@gmail.com>
Date: Thu, 12 Apr 2018 13:27:27 +0200
Subject: [PATCH] Check if charMeasure is defined in headless mode

---
 src/Terminal.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Terminal.ts b/src/Terminal.ts
index 3144ae93..7995c3a7 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -1927,7 +1927,7 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
 
     if (x === this.cols && y === this.rows) {
       // Check if we still need to measure the char size (fixes #785).
-      if (!this.charMeasure.width || !this.charMeasure.height) {
+      if (this.charMeasure && (!this.charMeasure.width || !this.charMeasure.height)) {
         this.charMeasure.measure(this.options);
       }
       return;