From 61fba697a0f93aa1f29967328f51eec93263aa4c Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Mon, 30 Aug 2021 13:43:33 +0200
Subject: [PATCH] Fix validating array loader handling of invalid target branch
 datatype

---
 src/Composer/Package/Loader/ValidatingArrayLoader.php | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/Composer/Package/Loader/ValidatingArrayLoader.php b/src/Composer/Package/Loader/ValidatingArrayLoader.php
index c275fc357..62fa84943 100644
--- a/src/Composer/Package/Loader/ValidatingArrayLoader.php
+++ b/src/Composer/Package/Loader/ValidatingArrayLoader.php
@@ -347,6 +347,13 @@ class ValidatingArrayLoader implements LoaderInterface
                 $this->errors[] = 'extra.branch-alias : must be an array of versions => aliases';
             } else {
                 foreach ($this->config['extra']['branch-alias'] as $sourceBranch => $targetBranch) {
+                    if (!is_string($targetBranch)) {
+                        $this->warnings[] = 'extra.branch-alias.'.$sourceBranch.' : the target branch ('.json_encode($targetBranch).') must be a string, "'.gettype($targetBranch).'" received.';
+                        unset($this->config['extra']['branch-alias'][$sourceBranch]);
+
+                        continue;
+                    }
+
                     // ensure it is an alias to a -dev package
                     if ('-dev' !== substr($targetBranch, -4)) {
                         $this->warnings[] = 'extra.branch-alias.'.$sourceBranch.' : the target branch ('.$targetBranch.') must end in -dev';