Fixed wrong parameter when saving space

datasets/datasets.php

@@ -24,7 +24,7 @@ function handle_get($request_data) {
 function handle_post($request_data) {
     $file_path = get_space_file_path($request_data["space_id"]);
 
-    file_put_contents($file_path, $request_data["graph"], "w");
+    file_put_contents($file_path, $request_data["graph"]);
 }
 
 function get_space_file_path($space_id) {