diff --git a/packages/PHPStanStaticTypeMapper/TypeMapper/ArrayShapeTypeMapper.php b/packages/PHPStanStaticTypeMapper/TypeMapper/ArrayShapeTypeMapper.php
index 08b092bb0d0..59ed6f2fc27 100644
--- a/packages/PHPStanStaticTypeMapper/TypeMapper/ArrayShapeTypeMapper.php
+++ b/packages/PHPStanStaticTypeMapper/TypeMapper/ArrayShapeTypeMapper.php
@@ -40,6 +40,11 @@ public function mapConstantArrayType(ConstantArrayType $constantArrayType): Arra
             }
 
             $keyValue = $keyType->getValue();
+
+            if ($this->reflectionProvider->hasClass($keyValue)) {
+                return null;
+            }
+
             $keyDocTypeNode = new IdentifierTypeNode($keyValue);
             $valueType = $constantArrayType->getValueTypes()[$index];
 
@@ -48,10 +53,6 @@ public function mapConstantArrayType(ConstantArrayType $constantArrayType): Arra
                 TypeKind::RETURN()
             );
 
-            if ($this->reflectionProvider->hasClass($keyValue)) {
-                return null;
-            }
-
             $arrayShapeItemNodes[] = new ArrayShapeItemNode(
                 $keyDocTypeNode,
                 $constantArrayType->isOptionalKey($index),