diff --git a/rules/type-declaration/src/TypeInferer/ReturnTypeInferer/ReturnTagReturnTypeInferer.php b/rules/type-declaration/src/TypeInferer/ReturnTypeInferer/ReturnTagReturnTypeInferer.php
index 2bfb1f0b205..c88c9c5b856 100644
--- a/rules/type-declaration/src/TypeInferer/ReturnTypeInferer/ReturnTagReturnTypeInferer.php
+++ b/rules/type-declaration/src/TypeInferer/ReturnTypeInferer/ReturnTagReturnTypeInferer.php
@@ -8,6 +8,7 @@ use PhpParser\Node\Expr\Closure;
 use PhpParser\Node\FunctionLike;
 use PhpParser\Node\Stmt\ClassMethod;
 use PhpParser\Node\Stmt\Function_;
+use PHPStan\Type\MixedType;
 use PHPStan\Type\Type;
 use Rector\BetterPhpDocParser\PhpDocInfo\PhpDocInfo;
 use Rector\NodeTypeResolver\Node\AttributeKey;
@@ -21,8 +22,11 @@ final class ReturnTagReturnTypeInferer extends AbstractTypeInferer implements Re
      */
     public function inferFunctionLike(FunctionLike $functionLike): Type
     {
-        /** @var PhpDocInfo $phpDocInfo */
+        /** @var PhpDocInfo|null $phpDocInfo */
         $phpDocInfo = $functionLike->getAttribute(AttributeKey::PHP_DOC_INFO);
+        if ($phpDocInfo === null) {
+            return new MixedType();
+        }
 
         return $phpDocInfo->getReturnType();
     }