Index: branches/5.2.x/core/kernel/processors/main_processor.php
===================================================================
--- branches/5.2.x/core/kernel/processors/main_processor.php
+++ branches/5.2.x/core/kernel/processors/main_processor.php
@@ -1157,7 +1157,7 @@
 		$esender = $this->Application->recallObject($pseudo);
 		/* @var $esender kEmailSendingHelper */
 
-		if ( file_exists($path) ) {
+		if ( file_exists($path) && is_file($path) ) {
 			$esender->AddAttachment($path);
 		}
 	}