looks like in
var treedatajson = "filtered_tree.json"; when it worked you were passing in the filename, and in
var treedatajson = JSON.parse(window.SESSION.filtered_tree); you were passing in the json data. What is the next line where you use
treedatajson? You are probably looking for a filename there instead of the parsed data.
... or maybe you should create a php endpoint that serves the session data as json... something like
<?php // filtered-tree.php session_start() header('Content-Type: application/json'); echo json_encode($_SESSION['TREE']); // or whatever the key is
and then in js
var treedatajson = "filtered-tree.php";
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