From 46525f863967bba1cf304a4f2654817a0b742d46 Mon Sep 17 00:00:00 2001
From: Morris Jobke <hey@morrisjobke.de>
Date: Thu, 10 Sep 2020 12:07:56 +0200
Subject: [PATCH] Change 0 to null to properly encode image to BMP if the first
 pixel is black

Ref #22288

Signed-off-by: Morris Jobke <hey@morrisjobke.de>
---
 lib/private/legacy/OC_Image.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/private/legacy/OC_Image.php b/lib/private/legacy/OC_Image.php
index 1e2791f62c9..3e9812c99f2 100644
--- a/lib/private/legacy/OC_Image.php
+++ b/lib/private/legacy/OC_Image.php
@@ -1211,7 +1211,7 @@ if (!function_exists('imagebmp')) {
 			} // RLE8
 			elseif ($compression == 1 && $bit == 8) {
 				for ($j = $height - 1; $j >= 0; $j--) {
-					$lastIndex = 0;
+					$lastIndex = null;
 					$sameNum = 0;
 					for ($i = 0; $i <= $width; $i++) {
 						$index = imagecolorat($im, $i, $j);
-- 
2.39.5