diff --git a/rules-tests/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector/Source/SomeSetterClass.php b/rules-tests/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector/Source/SomeSetterClass.php
index 36abfd51b98..7b0ff3a3afa 100644
--- a/rules-tests/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector/Source/SomeSetterClass.php
+++ b/rules-tests/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector/Source/SomeSetterClass.php
@@ -2,7 +2,7 @@
 
 namespace Rector\Tests\Unambiguous\Rector\Expression\FluentSettersToStandaloneCallMethodRector\Source;
 
-class SomeSetterClass
+final class SomeSetterClass
 {
     private ?string $name = null;
 
diff --git a/rules/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector.php b/rules/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector.php
index c00c7a1199e..f8f20a29626 100644
--- a/rules/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector.php
+++ b/rules/Unambiguous/Rector/Expression/FluentSettersToStandaloneCallMethodRector.php
@@ -11,6 +11,7 @@
 use PhpParser\Node\Expr\New_;
 use PhpParser\Node\Expr\Variable;
 use PhpParser\Node\Name;
+use PhpParser\Node\Stmt;
 use PhpParser\Node\Stmt\Expression;
 use PhpParser\Node\Stmt\Return_;
 use PHPStan\Reflection\ClassReflection;
@@ -113,6 +114,9 @@ public function refactor(Node $node): ?array
         }
 
         $rootExpr = $currentMethodCall;
+        if (! $rootExpr instanceof New_) {
+            return null;
+        }
 
         if ($this->shouldSkipForVendorOrInternal($firstMethodCall)) {
             return null;
@@ -120,28 +124,9 @@ public function refactor(Node $node): ?array
 
         $variableName = $this->resolveVariableName($rootExpr);
         $someVariable = new Variable($variableName);
-
         $firstAssign = new Assign($someVariable, $rootExpr);
-        $stmts = [new Expression($firstAssign)];
-
-        // revert to normal order
-        $methodCalls = array_reverse($methodCalls);
 
-        foreach ($methodCalls as $methodCall) {
-            $methodCall->var = $someVariable;
-            // inlines indent and removes () around first expr
-            $methodCall->setAttribute(AttributeKey::ORIGINAL_NODE, null);
-            $stmts[] = new Expression($methodCall);
-        }
-
-        if ($node instanceof Return_) {
-            $node->expr = $someVariable;
-            $stmts[] = $node;
-        }
-
-        $node->expr = $someVariable;
-
-        return $stmts;
+        return $this->createStmts($firstAssign, $methodCalls, $someVariable, $node);
     }
 
     private function resolveVariableName(Expr $expr): string
@@ -174,4 +159,36 @@ private function shouldSkipForVendorOrInternal(MethodCall $firstMethodCall): boo
 
         return false;
     }
+
+    /**
+     * @param MethodCall[] $methodCalls
+     * @return Stmt[]
+     */
+    private function createStmts(
+        Assign $firstAssign,
+        array $methodCalls,
+        Variable $someVariable,
+        Expression|Return_ $firstStmt
+    ): array {
+        $stmts = [new Expression($firstAssign)];
+
+        // revert to normal order
+        $methodCalls = array_reverse($methodCalls);
+
+        foreach ($methodCalls as $methodCall) {
+            $methodCall->var = $someVariable;
+            // inlines indent and removes () around first expr
+            $methodCall->setAttribute(AttributeKey::ORIGINAL_NODE, null);
+            $stmts[] = new Expression($methodCall);
+        }
+
+        if ($firstStmt instanceof Return_) {
+            $firstStmt->expr = $someVariable;
+            $stmts[] = $firstStmt;
+        }
+
+        $firstStmt->expr = $someVariable;
+
+        return $stmts;
+    }
 }