From 41a2aed0b519da37c03a1cf3546ae3ece95aaae5 Mon Sep 17 00:00:00 2001
From: Yoda-BZH <github@yoda-bzh.net>
Date: Thu, 31 Oct 2024 11:38:19 +0100
Subject: [PATCH] fix(csv): fix #5279 always force subject to be a string

When performing a str_replace, subject should always be a string. If
passing a non-existent column or empty column, subject may be null

This ensure str_replace is called when subject is actually a string (not
NULL)
---
 library/Icinga/File/Csv.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/library/Icinga/File/Csv.php b/library/Icinga/File/Csv.php
index 56ee233eeb..d189780403 100644
--- a/library/Icinga/File/Csv.php
+++ b/library/Icinga/File/Csv.php
@@ -37,7 +37,7 @@ public function __toString()
             }
             $out = array();
             foreach ($row as & $val) {
-                $out[] = '"' . str_replace('"', '""', $val) . '"';
+                $out[] = '"' . ($val ? str_replace('"', '""', $val) : '') . '"';
             }
             $csv .= implode(',', $out) . "\r\n";
         }