Index: branches/5.2.x/core/kernel/utility/email.php
===================================================================
--- branches/5.2.x/core/kernel/utility/email.php
+++ branches/5.2.x/core/kernel/utility/email.php
@@ -260,6 +260,7 @@
 		$plain_message_body = $this->_getMessageBody(false);
 
 		if ( $html_message_body === false && $plain_message_body === false ) {
+			$this->sender->Clear();
 			trigger_error('Message template is empty (maybe after parsing).', E_USER_WARNING);
 
 			return false;