From cfe718fa439ed76e7f09ce1b277dec4e9160c673 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Wed, 18 Aug 2021 14:29:49 +0200
Subject: [PATCH] Fix usage of getRequiredPackage, closes #10052

---
 src/Composer/DependencyResolver/Rule.php                    | 3 +++
 src/Composer/DependencyResolver/SolverProblemsException.php | 3 ++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Composer/DependencyResolver/Rule.php b/src/Composer/DependencyResolver/Rule.php
index 4eb9f7dd7..7b7c3c8f8 100644
--- a/src/Composer/DependencyResolver/Rule.php
+++ b/src/Composer/DependencyResolver/Rule.php
@@ -76,6 +76,9 @@ abstract class Rule
         return $this->reasonData;
     }
 
+    /**
+     * @return ?string
+     */
     public function getRequiredPackage()
     {
         $reason = $this->getReason();
diff --git a/src/Composer/DependencyResolver/SolverProblemsException.php b/src/Composer/DependencyResolver/SolverProblemsException.php
index c6844e25c..fecce8036 100644
--- a/src/Composer/DependencyResolver/SolverProblemsException.php
+++ b/src/Composer/DependencyResolver/SolverProblemsException.php
@@ -108,7 +108,8 @@ class SolverProblemsException extends \RuntimeException
     {
         foreach ($reasonSets as $reasonSet) {
             foreach ($reasonSet as $rule) {
-                if (0 === strpos($rule->getRequiredPackage(), 'ext-')) {
+                $required = $rule->getRequiredPackage();
+                if (null !== $required && 0 === strpos($required, 'ext-')) {
                     return true;
                 }
             }