diff --git a/fixtures/info/req-checker-old-req.phar b/fixtures/info/req-checker-old-req.phar
index 13d1d6e30..40676b02e 100755
Binary files a/fixtures/info/req-checker-old-req.phar and b/fixtures/info/req-checker-old-req.phar differ
diff --git a/src/RequirementChecker/Requirement.php b/src/RequirementChecker/Requirement.php
index f1ed580df..73feb9a7d 100644
--- a/src/RequirementChecker/Requirement.php
+++ b/src/RequirementChecker/Requirement.php
@@ -120,7 +120,7 @@ public static function fromArray(array $value): self
         return new self(
             RequirementType::from($value['type']),
             $value['condition'],
-            $value['source'],
+            $value['source'] ?? null,
             $value['message'],
             $value['helpMessage'],
         );
diff --git a/tests/Console/Command/InfoTest.php b/tests/Console/Command/InfoTest.php
index 60d565937..b0761d7be 100644
--- a/tests/Console/Command/InfoTest.php
+++ b/tests/Console/Command/InfoTest.php
@@ -677,18 +677,18 @@ public static function inputProvider(): iterable
                 Files Compression: None
 
                 Signature: SHA-1
-                Signature Hash: 92123D3800E1F6AD1CD1D4099B8D16BC51097A5C
+                Signature Hash: EEA3F86AA1B61484EE961055F43AA61805071CB1
 
                 Metadata: None
 
-                Timestamp: 1697988440 (2023-10-22T15:27:20+00:00)
+                Timestamp: 1699390728 (2023-11-07T20:58:48+00:00)
 
                 RequirementChecker:
                   Required:
                   - PHP >=5.3 (root)
                   - ext-phar (root)
 
-                Contents: 47 files (148.01KB)
+                Contents: 47 files (147.97KB)
 
                  // Use the --list|-l option to list the content of the PHAR.
 
diff --git a/tests/RequirementChecker/RequirementTest.php b/tests/RequirementChecker/RequirementTest.php
index 2da959c8d..f65a58889 100644
--- a/tests/RequirementChecker/RequirementTest.php
+++ b/tests/RequirementChecker/RequirementTest.php
@@ -131,6 +131,26 @@ public function test_it_can_be_created_for_a_conflicting_extension_constraint_fo
         self::assertItCanBeCreatedFromItsArrayForm($requirement, $actual);
     }
 
+    public function test_it_can_be_created_for_a_legacy_requirement(): void
+    {
+        $expected = new Requirement(
+            RequirementType::EXTENSION_CONFLICT,
+            'mbstring',
+            null,
+            'The package "box/test" conflicts with the extension "mbstring".',
+            'The package "box/test" conflicts with the extension "mbstring". You need to disable it in order to run this application.',
+        );
+
+        $actual = Requirement::fromArray([
+            'type' => 'extension-conflict',
+            'condition' => 'mbstring',
+            'message' => 'The package "box/test" conflicts with the extension "mbstring".',
+            'helpMessage' => 'The package "box/test" conflicts with the extension "mbstring". You need to disable it in order to run this application.',
+        ]);
+
+        self::assertEquals($expected, $actual);
+    }
+
     private static function assertItCanBeCreatedFromItsArrayForm(Requirement $expected, array $arrayForm): void
     {
         $actual = Requirement::fromArray($arrayForm);