Index: kernel/utility/logger.php
===================================================================
--- kernel/utility/logger.php	(revision 15552)
+++ kernel/utility/logger.php	(working copy)
@@ -767,7 +767,7 @@
 		$this->write();
 		$last_error = error_get_last();
 
-		if ( !is_null($last_error) ) {
+		if ( !is_null($last_error) && isset($this->_handlers[self::LL_ERROR]) ) {
 			$handler = $this->_handlers[self::LL_ERROR];
 			/* @var $handler kErrorHandlerStack */