diff --git a/src/Rules/ClassNameNodePair.php b/src/Rules/ClassNameNodePair.php
index cf39baa35c..5560390ce6 100644
--- a/src/Rules/ClassNameNodePair.php
+++ b/src/Rules/ClassNameNodePair.php
@@ -7,10 +7,16 @@
 final class ClassNameNodePair
 {
 
+	/**
+	 * @param non-empty-string $className
+	 */
 	public function __construct(private string $className, private Node $node)
 	{
 	}
 
+	/**
+	 * @return non-empty-string
+	 */
 	public function getClassName(): string
 	{
 		return $this->className;
diff --git a/src/Rules/FunctionDefinitionCheck.php b/src/Rules/FunctionDefinitionCheck.php
index 6c749bca6b..3e7cf63770 100644
--- a/src/Rules/FunctionDefinitionCheck.php
+++ b/src/Rules/FunctionDefinitionCheck.php
@@ -704,7 +704,7 @@ private function getParameterNode(
 	}
 
 	/**
-	 * @return string[]
+	 * @return non-empty-string[]
 	 */
 	private function getParameterReferencedClasses(ParameterReflection $parameter): array
 	{
@@ -732,7 +732,7 @@ private function getParameterReferencedClasses(ParameterReflection $parameter):
 	}
 
 	/**
-	 * @return string[]
+	 * @return non-empty-string[]
 	 */
 	private function getReturnTypeReferencedClasses(ParametersAcceptor $parametersAcceptor): array
 	{
diff --git a/src/Type/ObjectType.php b/src/Type/ObjectType.php
index de1e120173..3b7a72baaa 100644
--- a/src/Type/ObjectType.php
+++ b/src/Type/ObjectType.php
@@ -444,6 +444,10 @@ public function getUnresolvedStaticPropertyPrototype(string $propertyName, Class
 
 	public function getReferencedClasses(): array
 	{
+		if ($this->className === '') {
+			return [];
+		}
+
 		return [$this->className];
 	}
 
diff --git a/src/Type/Type.php b/src/Type/Type.php
index 19e474f9e3..9e3480016a 100644
--- a/src/Type/Type.php
+++ b/src/Type/Type.php
@@ -28,7 +28,7 @@ interface Type
 {
 
 	/**
-	 * @return list<string>
+	 * @return list<non-empty-string>
 	 */
 	public function getReferencedClasses(): array;