Version 5.0.0 beta 2

system/Widget/Area.php

@@ -656,6 +656,21 @@ class Area
 			}
 		}
 
+		/* Make sure that the widget actually exists, otherwise ignore it.
+		This can be an issue if a widget was added and now no longer exists in the system. */
+		try
+		{
+			if( !Widget::isValidWidget( Application::load( $block['app'] ), $block['key'] ) )
+			{
+				return $this;
+			}
+		}
+		catch( Exception )
+		{
+			return $this;
+		}
+
+
 		/* Load configuration */
 		if ( empty( $block['configuration'] ) or !is_array( $block['configuration'] ) )
 		{