From 8d4e05bedef4b77b10d75a8b2534dad99f234ba9 Mon Sep 17 00:00:00 2001
From: modela bitweaver <spiderr@bitweaver.org>
Date: Mon, 1 Feb 2021 22:44:01 -0500
Subject: index check in wiki diff

---
 includes/diff.php | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/includes/diff.php b/includes/diff.php
index 8b57d32..bcda57f 100644
--- a/includes/diff.php
+++ b/includes/diff.php
@@ -190,8 +190,11 @@ class _WikiDiffEngine
 	    $x1 = $xoff + (int)(($numer + ($xlim-$xoff)*$chunk) / $nchunks);
 	    for ( ; $x < $x1; $x++)
 	      {
-		$matches = $ymatches[$flip ? $this->yv[$x] : $this->xv[$x]];
-		if (!$matches)
+		$index = ($flip ? $this->yv[$x] : $this->xv[$x]);
+		if( !empty( $ymatches[$index] ) ) {
+			$matches = $ymatches[$index];
+		}
+		if (empty($matches))
 		    continue;
 		reset($matches);
 		while (list ($junk, $y) = each($matches))
-- 
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