diff --git a/packages/node_modules/@node-red/editor-client/src/js/history.js b/packages/node_modules/@node-red/editor-client/src/js/history.js
index b59af14d5..36acb4a2c 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/history.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/history.js
@@ -167,6 +167,7 @@ RED.history = (function() {
                 if (ev.subflow) {
                     inv_ev.subflow = {};
                     if (ev.subflow.hasOwnProperty('instances')) {
+                        inv_ev.subflow.instances = [];
                         ev.subflow.instances.forEach(function(n) {
                             inv_ev.subflow.instances.push(n);
                             var node = RED.nodes.node(n.id);