From b5aad9ec0d8881be1314ea356dbc05ae4492ec87 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Fri, 24 Feb 2023 17:41:59 +0100
Subject: [PATCH] Fix type error when upgrading composer

---
 src/Composer/Repository/FilesystemRepository.php | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Composer/Repository/FilesystemRepository.php b/src/Composer/Repository/FilesystemRepository.php
index 901a5ef16..abe76950d 100644
--- a/src/Composer/Repository/FilesystemRepository.php
+++ b/src/Composer/Repository/FilesystemRepository.php
@@ -163,9 +163,13 @@ class FilesystemRepository extends WritableArrayRepository
 
             $this->filesystem->filePutContentsIfModified($repoDir.'/installed.php', '<?php return ' . $this->dumpToPhpCode($versions) . ';'."\n");
             $installedVersionsClass = file_get_contents(__DIR__.'/../InstalledVersions.php');
-            $this->filesystem->filePutContentsIfModified($repoDir.'/InstalledVersions.php', $installedVersionsClass);
 
-            \Composer\InstalledVersions::reload($versions);
+            // this normally should not happen but during upgrades of Composer when it is installed in the project it is a possibility
+            if ($installedVersionsClass !== false) {
+                $this->filesystem->filePutContentsIfModified($repoDir.'/InstalledVersions.php', $installedVersionsClass);
+
+                \Composer\InstalledVersions::reload($versions);
+            }
         }
     }