From 5bccc5eff0aeaa809a82d7d5266d01f661fb6b1b 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 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Terminal.ts b/src/Terminal.ts
index 3144ae9305..97fd0f8c8f 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -1927,8 +1927,10 @@ 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) {
-        this.charMeasure.measure(this.options);
+      if (this.charMeasure) {
+        if (!this.charMeasure.width || !this.charMeasure.height) {
+          this.charMeasure.measure(this.options);
+        }
       }
       return;
     }