Version 5.0.0 beta 5

system/Events/Event.php

@@ -103,7 +103,10 @@ class Event
 				static::$_listeners = [];
 				foreach( $allListeners[ $class ] as $listener )
 				{
-					static::$_listeners[ $class ][] = new $listener;
+					if( class_exists( $listener ) )
+					{
+						static::$_listeners[ $class ][] = new $listener;
+					}
 				}
 			}
 
@@ -115,7 +118,10 @@ class Event
 				{
 					foreach( $listners as $listener )
 					{
-						static::$_listeners[ $class ][] = new $listener;
+						if( class_exists( $listener ) )
+						{
+							static::$_listeners[ $class ][] = new $listener;
+						}
 					}
 				}
 			}