BUGFIX: Fixed crash on older versions of PHP when the file does not e…

…xist

code/SecureFileController.php

@@ -66,7 +66,7 @@ public function handleRequest(SS_HTTPRequest $request, DataModel $model) {
 					Security::permissionFailure($self, 'You are not authorised to access this resource. Please log in.');
 				} else {
 					// File doesn't exist
-					return $this->httpError(404);
+					return $self->httpError(404);
 				}
 			}