Version 5.0.0 beta 4

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

@@ -752,7 +752,7 @@ class ajax extends Controller
 	public function getCsrfKey() : void
 	{
 		/* Don't cache the CSRF key */
-		Output::i()->pageCaching = FALSE;
+		Output::setCacheTime( false );
 
 		if ( isset( Request::i()->path ) )
 		{