diff --git a/rules/TypeDeclaration/Rector/FunctionLike/ReturnTypeDeclarationRector.php b/rules/TypeDeclaration/Rector/FunctionLike/ReturnTypeDeclarationRector.php
index 037f0fc841..b31b59e43d 100644
--- a/rules/TypeDeclaration/Rector/FunctionLike/ReturnTypeDeclarationRector.php
+++ b/rules/TypeDeclaration/Rector/FunctionLike/ReturnTypeDeclarationRector.php
@@ -21,6 +21,7 @@
 use Rector\Core\ValueObject\PhpVersionFeature;
 use Rector\NodeTypeResolver\Node\AttributeKey;
 use Rector\PHPStanStaticTypeMapper\Enum\TypeKind;
+use Rector\StaticTypeMapper\ValueObject\Type\NonExistingObjectType;
 use Rector\TypeDeclaration\PhpDocParser\NonInformativeReturnTagRemover;
 use Rector\TypeDeclaration\PhpParserTypeAnalyzer;
 use Rector\TypeDeclaration\TypeAlreadyAddedChecker\ReturnTypeAlreadyAddedChecker;
@@ -109,7 +110,7 @@ public function refactor(Node $node): ?Node
             [ReturnTypeDeclarationReturnTypeInfererTypeInferer::class]
         );
 
-        if ($inferedReturnType instanceof MixedType) {
+        if ($inferedReturnType instanceof MixedType || $inferedReturnType instanceof NonExistingObjectType) {
             return null;
         }