diff --git a/ui/analyse/src/ctrl.ts b/ui/analyse/src/ctrl.ts
index 75ccd7b7ed..6cd90c6303 100644
--- a/ui/analyse/src/ctrl.ts
+++ b/ui/analyse/src/ctrl.ts
@@ -42,6 +42,7 @@ import { storedProp, StoredBooleanProp } from 'common/storage';
 import { StudyCtrl } from './study/interfaces';
 import { StudyPracticeCtrl } from './study/practice/interfaces';
 import { valid as crazyValid } from './crazy/crazyCtrl';
+import {treeReconstruct} from './util';
 
 export default class AnalyseCtrl {
 
@@ -184,7 +185,7 @@ export default class AnalyseCtrl {
     this.ongoing = !this.synthetic && game.playable(data);
 
     const prevTree = merge && this.tree.root;
-    this.tree = makeTree(treeOps.reconstruct(this.data.treeParts));
+    this.tree = makeTree(treeReconstruct(this.data.treeParts));
     if (prevTree) this.tree.merge(prevTree);
 
     this.actionMenu = new ActionMenuCtrl();
diff --git a/ui/analyse/src/util.ts b/ui/analyse/src/util.ts
index 51cfd0e54c..ba2fb2f75f 100644
--- a/ui/analyse/src/util.ts
+++ b/ui/analyse/src/util.ts
@@ -191,3 +191,17 @@ export function option(value: string, current: string | undefined, name: string)
 export function scrollTo(el: HTMLElement | undefined, target: HTMLElement |  null) {
   if (el && target) el.scrollTop = target.offsetTop - el.offsetHeight / 2 + target.offsetHeight / 2;
 }
+
+export function treeReconstruct(parts: any): Tree.Node {	
+  const root = parts[0], nb = parts.length;	
+  let node = root, i: number;	
+  root.id = '';	
+  for (i = 1; i < nb; i++) {	
+    const n = parts[i];	
+    if (node.children) node.children.unshift(n);	
+    else node.children = [n];	
+    node = n;	
+  }	
+  node.children = node.children || [];	
+  return root;	
+}