From 9bb75784a8de05e59e52483d913d10598e5e0a71 Mon Sep 17 00:00:00 2001
From: "Felix W. Dekker" <felix@fwdekker.com>
Date: Sat, 1 Aug 2020 00:18:51 +0200
Subject: [PATCH] Solve miscellaneous out-of-range bug

Occurs sometimes when the number of open squares is less than the number of neighbouring covered squares.
---
 package.json          | 2 +-
 src/main/js/Solver.ts | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/package.json b/package.json
index c9c9679..4998c23 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "minesweeper",
-    "version": "0.0.40",
+    "version": "0.0.41",
     "description": "Just Minesweeper!",
     "author": "Felix W. Dekker",
     "browser": "dist/bundle.js",
diff --git a/src/main/js/Solver.ts b/src/main/js/Solver.ts
index c7cf309..64d6e95 100644
--- a/src/main/js/Solver.ts
+++ b/src/main/js/Solver.ts
@@ -173,7 +173,10 @@ export class Matrix {
 
         return range(this.colCount - 1)
             .map(it => {
-                const row = this.getRow(this.getCol(it).findIndex(it => it === 1));
+                const rowPivotIndex = this.getCol(it).findIndex(it => it === 1);
+                if (rowPivotIndex < 0) return undefined;
+
+                const row = this.getRow(rowPivotIndex);
                 if (row.slice(0, it).every(it => it === 0) && row.slice(it + 1, -1).every(it => it === 0))
                     return row.slice(-1)[0];