diff --git a/lib/SymbolTree.js b/lib/SymbolTree.js
index a4e596a..667cde9 100644
--- a/lib/SymbolTree.js
+++ b/lib/SymbolTree.js
@@ -669,6 +669,8 @@ class SymbolTree {
                 removeNode.parent = null;
                 removeNode.previousSibling = null;
                 removeNode.nextSibling = null;
+                removeNode.cachedIndex = -1;
+                removeNode.cachedIndexVersion = NaN;                
 
                 if (parentNode) {
                         parentNode.childrenChanged();