Version 5.0.0 beta 4

applications/core/modules/front/system/register.php

@@ -113,7 +113,7 @@ class register extends Controller
 			Output::i()->bodyClasses[] = 'ipsLayout_minimalNoHome';
 		}
 		Output::i()->sidebar['enabled'] = FALSE;
-		Output::i()->pageCaching = FALSE;
+		Output::setCacheTime( false );
 		Output::i()->linkTags['canonical'] = (string) Url::internal( 'app=core&module=system&controller=register', 'front', 'register' );
 	}