Oops, forgot to check if enabled at one point

inc/functions.php

@@ -1340,10 +1340,12 @@ function buildIndex() {
 			$filename = $board['dir'] . ($page==1 ? $config['file_index'] : sprintf($config['file_page'], $page));
 			file_unlink($filename);
 			
+			if ($config['api']['enabled']) {
 				$jsonFilename = $board['dir'] . ($page-1) . ".json";
 				file_unlink($jsonFilename);
 			}
 		}
+	}
 
 	// json api catalog
 	if ($config['api']['enabled']) {