From ca7a093e55b2de36fcb5e0520271988557e005af Mon Sep 17 00:00:00 2001
From: Tim <git@loken.nl>
Date: Wed, 23 Apr 2025 02:20:54 +0200
Subject: [PATCH] Fix myerss diff algorithm if first hit is a insert

---
 src/Service/SnipContent/MyersDiff.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/Service/SnipContent/MyersDiff.php b/src/Service/SnipContent/MyersDiff.php
index 8f55c93..b7342f6 100644
--- a/src/Service/SnipContent/MyersDiff.php
+++ b/src/Service/SnipContent/MyersDiff.php
@@ -62,8 +62,9 @@ class MyersDiff
                     $values[] = $b[$y];
                     $y++;
                 }
-                if ($solution[count($solution) - 1][0] === 'I') {
-                    $solution[count($solution) - 1][1] = array_merge($solution[count($solution) - 1][1], $values);
+                $solutionKey = count($solution) - 1;
+                if ($solutionKey >= 0 && $solution[$solutionKey][0] === 'I') {
+                    $solution[$solutionKey][1] = array_merge($solution[$solutionKey][1], $values);
                 } else {
                     $solution[] = ['I', $values];
                 }