diff --git a/packages/node_modules/@node-red/runtime/lib/multiplayer/index.js b/packages/node_modules/@node-red/runtime/lib/multiplayer/index.js
index adfa63c28..23c826e6d 100644
--- a/packages/node_modules/@node-red/runtime/lib/multiplayer/index.js
+++ b/packages/node_modules/@node-red/runtime/lib/multiplayer/index.js
@@ -23,14 +23,16 @@ module.exports = {
             if (existingSessionId) {
                 connections.delete(opts.session)
                 const session = sessions.get(existingSessionId)
-                session.active = false
-                session.idleTimeout = setTimeout(() => {
-                    sessions.delete(existingSessionId)
-                }, 30000)
-                runtime.events.emit('comms', {
-                    topic: "multiplayer/connection-removed",
-                    data: { session: existingSessionId }
-                })
+                if (session) {
+                    session.active = false
+                    session.idleTimeout = setTimeout(() => {
+                        sessions.delete(existingSessionId)
+                    }, 30000)
+                    runtime.events.emit('comms', {
+                        topic: "multiplayer/connection-removed",
+                        data: { session: existingSessionId }
+                    })
+                }
             }
         })
         runtime.events.on('comms:message:multiplayer/connect', (opts) => {