diff --git a/src/Installing/Ini/RemoveIniEntryWithFileGetContents.php b/src/Installing/Ini/RemoveIniEntryWithFileGetContents.php
index ffed9c30..adee0753 100644
--- a/src/Installing/Ini/RemoveIniEntryWithFileGetContents.php
+++ b/src/Installing/Ini/RemoveIniEntryWithFileGetContents.php
@@ -18,6 +18,8 @@
 use function file_exists;
 use function file_get_contents;
 use function in_array;
+use function is_array;
+use function is_dir;
 use function preg_replace;
 use function scandir;
 use function sprintf;
@@ -38,25 +40,28 @@ public function __invoke(Package $package, TargetPlatform $targetPlatform, Outpu
         }
 
         $additionalIniDirectory = $targetPlatform->phpBinaryPath->additionalIniDirectory();
-        if ($additionalIniDirectory !== null) {
-            $allIniFiles = array_merge(
-                array_map(
-                    static function (string $path) use ($additionalIniDirectory): string {
-                        return $additionalIniDirectory . DIRECTORY_SEPARATOR . $path;
-                    },
-                    array_filter(
-                        scandir($additionalIniDirectory),
-                        static function (string $path) use ($additionalIniDirectory): bool {
-                            if (in_array($path, ['.', '..'])) {
-                                return false;
-                            }
-
-                            return file_exists($additionalIniDirectory . DIRECTORY_SEPARATOR . $path);
+        if ($additionalIniDirectory !== null && file_exists($additionalIniDirectory) && is_dir($additionalIniDirectory)) {
+            $filenames = scandir($additionalIniDirectory);
+            if (is_array($filenames)) {
+                $allIniFiles = array_merge(
+                    array_map(
+                        static function (string $path) use ($additionalIniDirectory): string {
+                            return $additionalIniDirectory . DIRECTORY_SEPARATOR . $path;
                         },
+                        array_filter(
+                            $filenames,
+                            static function (string $path) use ($additionalIniDirectory): bool {
+                                if (in_array($path, ['.', '..'])) {
+                                    return false;
+                                }
+
+                                return file_exists($additionalIniDirectory . DIRECTORY_SEPARATOR . $path);
+                            },
+                        ),
                     ),
-                ),
-                $allIniFiles,
-            );
+                    $allIniFiles,
+                );
+            }
         }
 
         // Make sure all symlinks are resolved
diff --git a/test/unit/Installing/Ini/RemoveIniEntryWithFileGetContentsTest.php b/test/unit/Installing/Ini/RemoveIniEntryWithFileGetContentsTest.php
index e596825e..76259787 100644
--- a/test/unit/Installing/Ini/RemoveIniEntryWithFileGetContentsTest.php
+++ b/test/unit/Installing/Ini/RemoveIniEntryWithFileGetContentsTest.php
@@ -128,6 +128,46 @@ public function testRelevantIniFilesHaveExtensionRemoved(ExtensionType $extensio
         );
     }
 
+    #[DataProvider('extensionTypeProvider')]
+    public function testNonExistentAdditionalIniDirectoryDoesNotCrash(ExtensionType $extensionType): void
+    {
+        $phpBinaryPath = $this->createMock(PhpBinaryPath::class);
+        $phpBinaryPath
+            ->method('loadedIniConfigurationFile')
+            ->willReturn(null);
+        $phpBinaryPath
+            ->method('additionalIniDirectory')
+            ->willReturn('/this/path/should/not/exist/for/testing');
+
+        $package = new Package(
+            $this->createMock(CompletePackageInterface::class),
+            $extensionType,
+            ExtensionName::normaliseFromString('foobar'),
+            'foobar/foobar',
+            '1.2.3',
+            null,
+        );
+
+        $targetPlatform = new TargetPlatform(
+            OperatingSystem::NonWindows,
+            OperatingSystemFamily::Linux,
+            $phpBinaryPath,
+            Architecture::x86_64,
+            ThreadSafetyMode::ThreadSafe,
+            1,
+            null,
+        );
+
+        self::assertSame(
+            [],
+            (new RemoveIniEntryWithFileGetContents())(
+                $package,
+                $targetPlatform,
+                $this->createMock(OutputInterface::class),
+            ),
+        );
+    }
+
     #[RequiresOperatingSystemFamily('Linux')]
     public function testSymlinkedIniFilesAreResolved(): void
     {