Do not apply non-array package links in ArrayLoader (#11008)

src/Composer/Package/Loader/ArrayLoader.php

@@ -55,7 +55,9 @@ class ArrayLoader implements LoaderInterface
         $package = $this->createObject($config, $class);
 
         foreach (BasePackage::$supportedLinkTypes as $type => $opts) {
-            if (isset($config[$type])) {
+            if (!isset($config[$type]) || !is_array($config[$type])) {
+                continue;
+            }
             $method = 'set'.ucfirst($opts['method']);
             $package->{$method}(
                 $this->parseLinks(
@@ -66,7 +68,6 @@ class ArrayLoader implements LoaderInterface
                 )
             );
         }
-        }
 
         $package = $this->configureObject($package, $config);
 

tests/Composer/Test/Package/Loader/ArrayLoaderTest.php

@@ -402,4 +402,31 @@ class ArrayLoaderTest extends TestCase
         $package = $this->loader->load($config);
         $this->assertCount(0, $package->getRequires());
     }
+
+    public function testPackageLinksReplace(): void
+    {
+        $config = array(
+            'name' => 'acme/package',
+            'version' => 'dev-1',
+            'replace' => [
+                'coyote/package' => 'self.version',
+            ],
+        );
+
+        $package = $this->loader->load($config);
+        $this->assertArrayHasKey('coyote/package', $package->getReplaces());
+        $this->assertSame('dev-1', $package->getReplaces()['coyote/package']->getConstraint()->getPrettyString());
+    }
+
+    public function testPackageLinksReplaceInvalid(): void
+    {
+        $config = array(
+            'name' => 'acme/package',
+            'version' => 'dev-1',
+            'replace' => 'coyote/package',
+        );
+
+        $package = $this->loader->load($config);
+        $this->assertCount(0, $package->getReplaces());
+    }
 }