diff --git a/packages/node_modules/@node-red/runtime/lib/nodes/context/index.js b/packages/node_modules/@node-red/runtime/lib/nodes/context/index.js
index 36dfdf000..b779da63c 100644
--- a/packages/node_modules/@node-red/runtime/lib/nodes/context/index.js
+++ b/packages/node_modules/@node-red/runtime/lib/nodes/context/index.js
@@ -593,7 +593,7 @@ function clean(flowConfig) {
     const knownNodes = new Set(Object.keys(flowConfig.allNodes))
 
     // We need to alias all of the subflow instance contents
-    for (const subflow of Object.values(flowConfig.subflows)) {
+    for (const subflow of Object.values(flowConfig.subflows || {})) {
         subflow.instances.forEach(instance => {
             for (const nodeId of Object.keys(subflow.nodes || {})) {
                 knownNodes.add(`${instance.id}-${nodeId}`)