diff --git a/src/ServiceMap.php b/src/ServiceMap.php
index 00f3c3f..1c90359 100644
--- a/src/ServiceMap.php
+++ b/src/ServiceMap.php
@@ -14,7 +14,7 @@ final class ServiceMap
     private $services = [];
 
     /**
-     * @var string[][]
+     * @var (string[]|object)[]
      */
     private $components = [];
 
@@ -43,6 +43,15 @@ public function __construct(string $configPath)
         }
 
         foreach ($config['components'] ?? [] as $id => $component) {
+            if (is_object($component)) {
+                $this->components[$id] = $component;
+                continue;
+            }
+
+            if (!is_array($component)) {
+                throw new \RuntimeException(sprintf('Invalid value for component with id %s. Expected object or array.', $id));
+            }
+
             if (null !== $identityClass = $component['identityClass'] ?? null) {
                 $this->components[$id]['identityClass'] = $identityClass;
             }
@@ -64,6 +73,11 @@ public function getServiceClassFromNode(Node $node): ?string
 
     public function getComponentClassById(string $id): ?string
     {
+        // Special case in which the component is already initialized
+        if (is_object($this->components[$id])) {
+            return get_class($this->components[$id]);
+        }
+
         return $this->components[$id]['class'] ?? null;
     }
 
diff --git a/tests/ServiceMapTest.php b/tests/ServiceMapTest.php
index d81bdfb..a497752 100644
--- a/tests/ServiceMapTest.php
+++ b/tests/ServiceMapTest.php
@@ -27,6 +27,14 @@ public function testThrowExceptionWhenClosureServiceHasMissingReturnType(): void
         new ServiceMap(__DIR__.DIRECTORY_SEPARATOR.'assets'.DIRECTORY_SEPARATOR.'yii-config-invalid.php');
     }
 
+    public function testThrowExceptionWhenComponentHasInvalidValue(): void
+    {
+        $this->expectException(\RuntimeException::class);
+        $this->expectExceptionMessage('Invalid value for component with id customComponent. Expected object or array.');
+
+        new ServiceMap(__DIR__.DIRECTORY_SEPARATOR.'assets'.DIRECTORY_SEPARATOR.'yii-config-invalid-component.php');
+    }
+
     public function testItLoadsServicesAndComponents(): void
     {
         $serviceMap = new ServiceMap(__DIR__.DIRECTORY_SEPARATOR.'assets'.DIRECTORY_SEPARATOR.'yii-config-valid.php');
@@ -36,6 +44,7 @@ public function testItLoadsServicesAndComponents(): void
         $this->assertSame(\SplFileInfo::class, $serviceMap->getServiceClassFromNode(new String_('nested-service-class')));
 
         $this->assertSame(MyActiveRecord::class, $serviceMap->getComponentClassById('customComponent'));
+        $this->assertSame(MyActiveRecord::class, $serviceMap->getComponentClassById('customInitializedComponent'));
     }
 
     /**
diff --git a/tests/assets/yii-config-invalid-component.php b/tests/assets/yii-config-invalid-component.php
new file mode 100644
index 0000000..2671607
--- /dev/null
+++ b/tests/assets/yii-config-invalid-component.php
@@ -0,0 +1,7 @@
+<?php
+
+return [
+    'components' => [
+        'customComponent' => 5,
+    ],
+];
diff --git a/tests/assets/yii-config-valid.php b/tests/assets/yii-config-valid.php
index 39e05e6..36896bb 100644
--- a/tests/assets/yii-config-valid.php
+++ b/tests/assets/yii-config-valid.php
@@ -7,6 +7,7 @@
         'customComponent' => [
             'class' => MyActiveRecord::class,
         ],
+        'customInitializedComponent' => new MyActiveRecord(),
     ],
     'container' => [
         'singletons' => [