diff --git a/src/Iloveimg.php b/src/Iloveimg.php
index ce2f295..a476179 100644
--- a/src/Iloveimg.php
+++ b/src/Iloveimg.php
@@ -34,7 +34,7 @@ class Iloveimg
     // @var string|null The version of the Iloveimg API to use for requests.
     public static $apiVersion = 'v1';
 
-    const VERSION = 'php.1.0.2';
+    const VERSION = 'php.1.1.16';
 
     public $token = null;
 
@@ -187,6 +187,9 @@ public function sendRequest($method, $endpoint, $body = null, $start = false)
                 throw new AuthException($response->body->name, $response->code, null, $response);
             }
             if ($endpoint == 'upload') {
+                if(is_string($response->body)){
+                    throw new UploadException("Upload error", $response->code, null, $response);
+                }
                 throw new UploadException($response->body->error->message, $response->code, null, $response);
             } elseif ($endpoint == 'process') {
                 throw new ProcessException($response->body->error->message, $response->code, null, $response);
diff --git a/src/ImageTask.php b/src/ImageTask.php
index cbc4fc8..548fc5a 100644
--- a/src/ImageTask.php
+++ b/src/ImageTask.php
@@ -179,6 +179,10 @@ public function addFileFromUrl($url)
      */
     public function uploadFile($task, $filepath)
     {
+        if(!file_exists($filepath)){
+            throw new \InvalidArgumentException('File '.$filepath.' does not exists');
+        }
+
         $data = array('task' => $task, 'v' => self::VERSION);
         $files = array('file' => $filepath);
         $body = Request\Body::multipart($data, $files);