diff --git a/src/Core/Message/Attachment.php b/src/Core/Message/Attachment.php
index a6f0e76..f1d7916 100644
--- a/src/Core/Message/Attachment.php
+++ b/src/Core/Message/Attachment.php
@@ -226,7 +226,7 @@ class Attachment
         $this->attachment['ifdparameters'] = (isset($this->part->ifdparameters)) ? $this->part->ifdparameters : false;
         $this->attachment['ifparameters'] = (isset($this->part->ifparameters)) ? $this->part->ifparameters : false;
 
-        if (\is_array($this->part->dparameters)) {
+        if (isset($this->part->dparameters) && \is_array($this->part->dparameters)) {
             foreach ($this->part->dparameters as $obj) {
                 if (\in_array(mb_strtolower($obj->attribute), ['filename', 'name'], true)) {
                     $this->attachment[mb_strtolower($obj->attribute)] = pathinfo($obj->value, PATHINFO_FILENAME);
@@ -235,7 +235,7 @@ class Attachment
             }
         }
 
-        if (\is_array($this->part->parameters)) {
+        if (isset($this->part->parameters) && \is_array($this->part->parameters)) {
             foreach ($this->part->parameters as $obj) {
                 if (\in_array(mb_strtolower($obj->attribute), ['filename', 'name'], true)) {
                     $this->attachment[mb_strtolower($obj->attribute)] = pathinfo($obj->value, PATHINFO_FILENAME);