From b162582e668398179d440aca8629a0f2b6cbfc6d Mon Sep 17 00:00:00 2001
From: npezza93 <npezza93@gmail.com>
Date: Sat, 21 Apr 2018 08:52:12 -0400
Subject: [PATCH 1/2] Handle if getCoords returns null in the AltClickHandler

Fixes #1397
---
 src/handlers/AltClickHandler.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/handlers/AltClickHandler.ts b/src/handlers/AltClickHandler.ts
index 85465272..6b980fe6 100644
--- a/src/handlers/AltClickHandler.ts
+++ b/src/handlers/AltClickHandler.ts
@@ -28,7 +28,7 @@ export class AltClickHandler {
     this._startCol = this._terminal.buffer.x;
     this._startRow = this._terminal.buffer.y;
 
-    [this._endCol, this._endRow] = this._terminal.mouseHelper.getCoords(
+    let coordinates = this._terminal.mouseHelper.getCoords(
       this._mouseEvent,
       this._terminal.element,
       this._terminal.charMeasure,
@@ -36,7 +36,13 @@ export class AltClickHandler {
       this._terminal.cols,
       this._terminal.rows,
       false
-    ).map((coordinate: number) => {
+    );
+
+    if (!coordinates) {
+      return null;
+    }
+
+    [this._endCol, this._endRow] = coordinates.map((coordinate: number) => {
       return coordinate - 1;
     });
   }

From 4edbd507e5717669ebe57c20657053fa9bae06c9 Mon Sep 17 00:00:00 2001
From: npezza93 <npezza93@gmail.com>
Date: Wed, 9 May 2018 19:35:02 -0400
Subject: [PATCH 2/2] Check if endCol and endRow are present before handling an
 alt click

---
 src/handlers/AltClickHandler.ts | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/src/handlers/AltClickHandler.ts b/src/handlers/AltClickHandler.ts
index 6b980fe6..7f2e4f05 100644
--- a/src/handlers/AltClickHandler.ts
+++ b/src/handlers/AltClickHandler.ts
@@ -38,20 +38,18 @@ export class AltClickHandler {
       false
     );
 
-    if (!coordinates) {
-      return null;
+    if (coordinates) {
+      [this._endCol, this._endRow] = coordinates.map((coordinate: number) => {
+        return coordinate - 1;
+      });
     }
-
-    [this._endCol, this._endRow] = coordinates.map((coordinate: number) => {
-      return coordinate - 1;
-    });
   }
 
   /**
    * Writes the escape sequences of arrows to the terminal
    */
   public move(): void {
-    if (this._mouseEvent.altKey) {
+    if (this._mouseEvent.altKey && this._endCol !== undefined && this._endRow !== undefined) {
       this._terminal.send(this._arrowSequences());
     }
   }