diff --git a/mail.php b/mail.php
index efd336a..da3fef0 100644
--- a/mail.php
+++ b/mail.php
@@ -239,7 +239,8 @@ class mail
     */
   private function readMailContentRecurse ($partinfo, $sectionIDParent=false)
   {
-    if (substr ($partinfo["_contentType"], 0, 10) === "multipart/")
+    if (key_exists ("_contentType", $partinfo) &&
+        substr ($partinfo["_contentType"], 0, 10) === "multipart/")
     {
       // multipart/alternative, multipart/related, multipart/mixed
       // Remove the content, as it is not valuable (will be stored in childs)
@@ -911,6 +912,8 @@ class mail
     $res = array ();
     foreach ($this->sections as $sectionID=>$section)
     {
+      if (! key_exists ("_headersArray", $section))
+        continue;
       $disposition = $this->getHeaderValue ("Content-Disposition",
                                             $section["_headersArray"]);
       if ($disposition === false)
@@ -1202,7 +1205,8 @@ class mail
     if ($headers === null)
     {
       $sectionMainID = $this->sectionMainID ();
-      if ($sectionMainID === false)
+      if ($sectionMainID === false ||
+          ! key_exists ("_headersArray", $this->sections[$sectionMainID]))
         $headers = array ();
       else
         $headers = $this->sections[$sectionMainID]["_headersArray"];
@@ -1228,7 +1232,8 @@ class mail
     if ($headers === null)
     {
       $sectionMainID = $this->sectionMainID ();
-      if ($sectionMainID === false)
+      if ($sectionMainID === false ||
+          ! key_exists ("_headersArray", $this->sections[$sectionMainID]))
         $headers = array ();
       else
         $headers = $this->sections[$sectionMainID]["_headersArray"];