feat: added null check for previous Error

app/controllers/shared/api.php

@@ -122,8 +122,6 @@ App::shutdown(function ($utopia, $request, $response, $project, $events, $audits
     /** @var Appwrite\Event\Event $functions */
     /** @var bool $mode */
 
-    var_dump("*********** In api.php shutdown *************");
-
     if (!empty($events->getParam('event'))) {
         if(empty($events->getParam('payload'))) {
             $events->setParam('payload', $response->getPayload());

src/Appwrite/GraphQL/Builder.php

@@ -296,7 +296,7 @@ class Builder {
         $errorFormatter = function(Error $error) use ($isDevelopment, $version) {
             $formattedError = FormattedError::createFromException($error);
             /**  Previous error represents the actual error thrown by Appwrite server */
-            $previousError = $error->getPrevious();
+            $previousError = $error->getPrevious() ?? $error;
             $formattedError['code'] = $previousError->getCode();
             $formattedError['version'] = $version;
             if ($isDevelopment) {