Version 5.0.0 beta 4

system/Widget/Area.php

@@ -673,6 +673,13 @@ class Area
 			return $this;
 		}
 
+		/* Can this widget be dropped into this area? */
+		/* @var Widget $widgetClass */
+		$widgetClass = 'IPS\\' . $block['app'] . '\\widgets\\' . $block['key'];
+		if( class_exists( $widgetClass ) and in_array( $this->id, $widgetClass::$disallowedAreas ) )
+		{
+			return $this;
+		}
 
 		/* Load configuration */
 		if ( empty( $block['configuration'] ) or !is_array( $block['configuration'] ) )