diff --git a/src/Helper/MyParcelCurl.php b/src/Helper/MyParcelCurl.php
index 9dc809f5..6fe606c8 100644
--- a/src/Helper/MyParcelCurl.php
+++ b/src/Helper/MyParcelCurl.php
@@ -272,7 +272,7 @@ public function getInfo($opt = 0)
      */
     public function setUserAgent($agent)
     {
-        return curl_setopt($this->_getResource(), CURLOPT_USERAGENT, $agent);
+        return curl_setopt($this->_getResource(), CURLOPT_USERAGENT, (string)$agent);
     }
 
     /**
diff --git a/src/Model/MyParcelRequest.php b/src/Model/MyParcelRequest.php
index de5195d5..658b3554 100644
--- a/src/Model/MyParcelRequest.php
+++ b/src/Model/MyParcelRequest.php
@@ -257,11 +257,14 @@ public function setUserAgent($userAgent)
      */
     public function getUserAgentFromComposer()
     {
-        $composerData = file_get_contents('../../composer.json');
-        $jsonComposerData = json_decode($composerData, true);
-        if (!empty($jsonComposerData['version'])) {
-            $version = str_replace('v', '', $jsonComposerData['version']);
-            return 'MyParcelNL-SDK/' . $version;
+        $composer = 'vendor/myparcelnl/sdk/composer.json';
+        if (file_exists($composer)) {
+            $composerData = file_get_contents($composer);
+            $jsonComposerData = json_decode($composerData, true);
+            if (!empty($jsonComposerData['version'])) {
+                $version = str_replace('v', '', $jsonComposerData['version']);
+                return 'MyParcelNL-SDK/' . $version;
+            }
         }
 
         return null;