--- a/mailnews/mime/src/mimedrft.cpp
+++ b/mailnews/mime/src/mimedrft.cpp
@@ -1479,17 +1479,17 @@ mime_parse_stream_complete(nsMIMESession
           //We cannot use this kind of data for the message body! Therefore, move it as attachment
           bodyAsAttachment = true;
       }
       else
         composeFormat = nsIMsgCompFormat::PlainText;
 
       char *body = nullptr;
 
-      if (!bodyAsAttachment)
+      if (!bodyAsAttachment && mdd->messageBody->m_tmpFile)
       {
         int64_t fileSize;
         nsCOMPtr<nsIFile> tempFileCopy;
         mdd->messageBody->m_tmpFile->Clone(getter_AddRefs(tempFileCopy));
         mdd->messageBody->m_tmpFile = do_QueryInterface(tempFileCopy);
         tempFileCopy = nullptr;
         mdd->messageBody->m_tmpFile->GetFileSize(&fileSize);
         uint32_t bodyLen = 0;